title: Moving from highcharts 3.0 to 4.0: grouped column weird behavior
body: <p>I've been working on older code written for Highcharts 2.x. It was working fine with 3.0 but when moving to 4.0 we saw this weird behavior:</p>
  
  <p><a href="http://jsfiddle.net/pfofo973/2/" rel="nofollow">http://jsfiddle.net/pfofo973/2/</a></p>
  
  <p>As you can see, each period on the X axis has two stacked columns. The problem is that the first column isn't touching the X axis but has some kind of padding below it. Any idea how to correct that?</p>
  
  <p>Thanks!</p>
  
  <p>Here is the JS code:</p>
  
  <pre><code>chart = new Highcharts.Chart({
      "chart": {
          "renderTo": "container",
          "defaultSeriesType": "column",
          "marginTop": 100,
          "marginBottom": 20,
          "zoomType": "x",
          "spacingRight": 20
      },
      "title": {
          "text": "Activity Overview"
      },
      "subtitle": {
          "text": "Grouped per week"
      },
      "xAxis": {
          "type": "datetime",
          "tickInterval": 604800000,
          "tickWidth": 0,
          "maxZoom": 1209600000,
          "x": -30,
          "labels": {}
      },
      "yAxis": [
          {
              "title": {
                  "text": "Days"
              },
              "endOnTick": false,
              "maxPadding": 1,
              "categories": [],
              "index": 0
          },
          {
              "gridLineWidth": 0,
              "maxPadding": 1,
              "categories": [],
              "title": {
                  "text": "Number",
                  "style": {
                      "color": "#AA4643"
                  }
              },
              "labels": {
                  "style": {
                      "color": "#AA4643"
                  }
              },
              "opposite": true,
              "index": 1
          },
          {
              "gridLineWidth": 0,
              "maxPadding": 0.8,
              "endOnTick": false,
              "lineWidth": 0,
              "categories": [],
              "opposite": true,
              "tickLength": 0,
              "max": 300,
              "title": {
                  "text": ""
              },
              "labels": {
                  "text": ""
              },
              "index": 2
          },
          {
              "gridLineWidth": 0,
              "endOnTick": false,
              "minPadding": 6,
              "maxPadding": 0.5,
              "lineWidth": 0,
              "opposite": true,
              "tickLength": 0,
              "max": 100,
              "min": 50,
              "categories": [],
              "title": {
                  "text": ""
              },
              "labels": {
                  "text": ""
              },
              "index": 3
          }
      ],
      "legend": {
          "align": "left",
          "verticalAlign": "top",
          "y": 40,
          "floating": true,
          "borderWidth": 0
      },
      "tooltip": {
          "shared": true,
          "crosshairs": true,
          "useHTML": true
      },
      "plotOptions": {
          "column": {
              "stacking": "normal"
          },
          "spline": {
              "lineWidth": 1,
              "dashStyle": "ShortDot",
              "marker": {
                  "enabled": false,
                  "states": {
                      "hover": {
                          "enabled": true,
                          "radius": 4
                      }
                  }
              }
          }
      },
      "series": [
          {
              "name": "c1",
              "stack": "survey",
              "yAxis": 0,
              "data": [
                  [
                      1406444400000,
                      7.3
                  ],
                  [
                      1407049200000,
                      8.2
                  ],
                  [
                      1407654000000,
                      7.8
                  ],
                  [
                      1408258800000,
                      8.9
                  ],
                  [
                      1408863600000,
                      6.7
                  ],
                  [
                      1409468400000,
                      8
                  ],
                  [
                      1410073200000,
                      8.4
                  ],
                  [
                      1410678000000,
                      6.5
                  ],
                  [
                      1411282800000,
                      6.6
                  ],
                  [
                      1411887600000,
                      4.9
                  ],
                  [
                      1412492400000,
                      1.8
                  ]
              ],
              "_colorIndex": 0
          },
          {
              "name": "R1",
              "stack": "survey",
              "yAxis": 0,
              "data": [
                  [
                      1406444400000,
                      4.2
                  ],
                  [
                      1407049200000,
                      3.9
                  ],
                  [
                      1407654000000,
                      3.9
                  ],
                  [
                      1408258800000,
                      5.3
                  ],
                  [
                      1408863600000,
                      3.2
                  ],
                  [
                      1409468400000,
                      4.4
                  ],
                  [
                      1410073200000,
                      3.1
                  ],
                  [
                      1410678000000,
                      2.8
                  ],
                  [
                      1411282800000,
                      2.8
                  ],
                  [
                      1411887600000,
                      2.2
                  ],
                  [
                      1412492400000,
                      0.9
                  ]
              ],
              "_colorIndex": 1
          },
          {
              "name": "A1",
              "stack": "survey",
              "yAxis": 0,
              "data": [
                  [
                      1406444400000,
                      1.8
                  ],
                  [
                      1407049200000,
                      1.7
                  ],
                  [
                      1407654000000,
                      1.5
                  ],
                  [
                      1408258800000,
                      0.9
                  ],
                  [
                      1408863600000,
                      1.7
                  ],
                  [
                      1409468400000,
                      1.3
                  ],
                  [
                      1410073200000,
                      1.3
                  ],
                  [
                      1410678000000,
                      1.9
                  ],
                  [
                      1411282800000,
                      1.2
                  ],
                  [
                      1411887600000,
                      1.2
                  ],
                  [
                      1412492400000,
                      0.4
                  ]
              ],
              "_colorIndex": 2
          },
          {
              "name": "Nb R",
              "type": "spline",
              "color": "#AA4643",
              "yAxis": 1,
              "data": [
                  [
                      1406444400000,
                      3.7
                  ],
                  [
                      1407049200000,
                      3.8
                  ],
                  [
                      1407654000000,
                      4.1
                  ],
                  [
                      1408258800000,
                      4.1
                  ],
                  [
                      1408863600000,
                      3.6
                  ],
                  [
                      1409468400000,
                      3.8
                  ],
                  [
                      1410073200000,
                      3.8
                  ],
                  [
                      1410678000000,
                      3.5
                  ],
                  [
                      1411282800000,
                      3.8
                  ],
                  [
                      1411887600000,
                      3.3
                  ],
                  [
                      1412492400000,
                      3.1
                  ]
              ],
              "_symbolIndex": 0
          },
          {
              "name": "P",
              "stack": "rater",
              "stacking": "percent",
              "color": "#64E572",
              "yAxis": 2,
              "showInLegend": false,
              "data": [
                  [
                      1406444400000,
                      34.55
                  ],
                  [
                      1407049200000,
                      23.84
                  ],
                  [
                      1407654000000,
                      38.58
                  ],
                  [
                      1408258800000,
                      27.78
                  ],
                  [
                      1408863600000,
                      34.07
                  ],
                  [
                      1409468400000,
                      33.75
                  ],
                  [
                      1410073200000,
                      38.71
                  ],
                  [
                      1410678000000,
                      38.07
                  ],
                  [
                      1411282800000,
                      31.35
                  ],
                  [
                      1411887600000,
                      27.95
                  ],
                  [
                      1412492400000,
                      30
                  ]
              ]
          },
          {
              "name": "S",
              "stack": "rater",
              "stacking": "percent",
              "color": "#508432",
              "yAxis": 2,
              "showInLegend": false,
              "data": [
                  [
                      1406444400000,
                      49.09
                  ],
                  [
                      1407049200000,
                      49.01
                  ],
                  [
                      1407654000000,
                      44.67
                  ],
                  [
                      1408258800000,
                      50.56
                  ],
                  [
                      1408863600000,
                      49.12
                  ],
                  [
                      1409468400000,
                      51.25
                  ],
                  [
                      1410073200000,
                      46.08
                  ],
                  [
                      1410678000000,
                      42.64
                  ],
                  [
                      1411282800000,
                      51.89
                  ],
                  [
                      1411887600000,
                      56.52
                  ],
                  [
                      1412492400000,
                      61.67
                  ]
              ]
          },
          {
              "name": "Su",
              "stack": "rater",
              "stacking": "percent",
              "color": "#058DC7",
              "yAxis": 2,
              "showInLegend": false,
              "data": [
                  [
                      1406444400000,
                      3.64
                  ],
                  [
                      1407049200000,
                      4.64
                  ],
                  [
                      1407654000000,
                      1.52
                  ],
                  [
                      1408258800000,
                      7.22
                  ],
                  [
                      1408863600000,
                      3.98
                  ],
                  [
                      1409468400000,
                      3.75
                  ],
                  [
                      1410073200000,
                      0.92
                  ],
                  [
                      1410678000000,
                      3.55
                  ],
                  [
                      1411282800000,
                      3.24
                  ],
                  [
                      1411887600000,
                      2.48
                  ],
                  [
                      1412492400000,
                      3.33
                  ]
              ]
          },
          {
              "name": "F",
              "stack": "rater",
              "stacking": "percent",
              "color": "#24CBE5",
              "yAxis": 2,
              "showInLegend": false,
              "data": [
                  [
                      1406444400000,
                      6.36
                  ],
                  [
                      1407049200000,
                      10.6
                  ],
                  [
                      1407654000000,
                      8.63
                  ],
                  [
                      1408258800000,
                      6.11
                  ],
                  [
                      1408863600000,
                      3.54
                  ],
                  [
                      1409468400000,
                      3.13
                  ],
                  [
                      1410073200000,
                      4.15
                  ],
                  [
                      1410678000000,
                      5.08
                  ],
                  [
                      1411282800000,
                      3.24
                  ],
                  [
                      1411887600000,
                      6.83
                  ],
                  [
                      1412492400000,
                      1.67
                  ]
              ]
          },
          {
              "name": "Pr",
              "stack": "rater",
              "stacking": "percent",
              "color": "#DDDF00",
              "yAxis": 2,
              "showInLegend": false,
              "data": [
                  [
                      1406444400000,
                      null
                  ],
                  [
                      1407049200000,
                      4.64
                  ],
                  [
                      1407654000000,
                      1.02
                  ],
                  [
                      1408258800000,
                      null
                  ],
                  [
                      1408863600000,
                      0.88
                  ],
                  [
                      1409468400000,
                      3.13
                  ],
                  [
                      1410073200000,
                      2.3
                  ],
                  [
                      1410678000000,
                      null
                  ],
                  [
                      1411282800000,
                      null
                  ],
                  [
                      1411887600000,
                      1.24
                  ],
                  [
                      1412492400000,
                      null
                  ]
              ]
          },
          {
              "name": "Cl",
              "stack": "rater",
              "stacking": "percent",
              "color": "#ED5618",
              "yAxis": 2,
              "showInLegend": false,
              "data": [
                  [
                      1406444400000,
                      null
                  ],
                  [
                      1407049200000,
                      null
                  ],
                  [
                      1407654000000,
                      1.02
                  ],
                  [
                      1408258800000,
                      2.22
                  ],
                  [
                      1408863600000,
                      0.44
                  ],
                  [
                      1409468400000,
                      0.63
                  ],
                  [
                      1410073200000,
                      0.92
                  ],
                  [
                      1410678000000,
                      2.03
                  ],
                  [
                      1411282800000,
                      1.08
                  ],
                  [
                      1411887600000,
                      null
                  ],
                  [
                      1412492400000,
                      null
                  ]
              ]
          },
          {
              "name": "Other",
              "stack": "rater",
              "stacking": "percent",
              "color": "#FF9655",
              "yAxis": 2,
              "showInLegend": false,
              "data": [
                  [
                      1406444400000,
                      6.36
                  ],
                  [
                      1407049200000,
                      7.28
                  ],
                  [
                      1407654000000,
                      4.57
                  ],
                  [
                      1408258800000,
                      6.11
                  ],
                  [
                      1408863600000,
                      7.96
                  ],
                  [
                      1409468400000,
                      4.38
                  ],
                  [
                      1410073200000,
                      6.91
                  ],
                  [
                      1410678000000,
                      8.63
                  ],
                  [
                      1411282800000,
                      9.19
                  ],
                  [
                      1411887600000,
                      4.97
                  ],
                  [
                      1412492400000,
                      3.33
                  ]
              ]
          },
          {
              "type": "line",
              "name": "QoH",
              "yAxis": 3,
              "data": [
                  [
                      1406444400000,
                      96.5
                  ],
                  [
                      1407049200000,
                      96.2
                  ],
                  [
                      1407654000000,
                      94.7
                  ],
                  [
                      1408258800000,
                      95.9
                  ],
                  [
                      1408863600000,
                      95.1
                  ],
                  [
                      1409468400000,
                      95.3
                  ],
                  [
                      1410073200000,
                      96.3
                  ],
                  [
                      1410678000000,
                      94.4
                  ],
                  [
                      1411282800000,
                      96.6
                  ],
                  [
                      1411887600000,
                      96.8
                  ],
                  [
                      1412492400000,
                      98.1
                  ]
              ],
              "_colorIndex": 3,
              "_symbolIndex": 1
          }
      ]
  });
  </code></pre>