title: Sum function returns zero
body: <p>I keep getting <code>0</code> when summing cells in a column in my Google Spreadsheet:</p>
  
  <p><a href="https://i.stack.imgur.com/BORv1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BORv1.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/joUFr.png" rel="noreferrer"><img src="https://i.stack.imgur.com/joUFr.png" alt="enter image description here"></a></p>
  
  <p>I have verified that the format for both columns are Number:</p>
  
  <p><a href="https://i.stack.imgur.com/bfOyE.png" rel="noreferrer"><img src="https://i.stack.imgur.com/bfOyE.png" alt="enter image description here"></a></p>
  
  <p>If I skip the decimal it works fine:</p>
  
  <p><a href="https://i.stack.imgur.com/LWZpJ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/LWZpJ.png" alt="enter image description here"></a></p>
  
  <p>Works fine in MS Excel:</p>
  
  <p><a href="https://i.stack.imgur.com/26Hqg.png" rel="noreferrer"><img src="https://i.stack.imgur.com/26Hqg.png" alt="enter image description here"></a></p>
  
  <p>What is going on?</p>