title: POI: wrong number of cell per row form method getPhysicalNumberOfCells
body: <p>I'm using POI java library to read an Excel.</p>
  
  <p>My Exel have a simple structure composed by 8 columns.</p>
  
  <p>The problem is that reading column length by method getPhysicalNumberOfCells I get different number for each row.</p>