I have a simple spreadsheet just for entering data, no formulas. The heading rows at the top have a size of 24. The rows under those are set to 15. Every time I enter any data in a cell, it seems to very quickly add a row and then set the height of that new row to the default of 12.75. My typed data goes into this newly created smaller row. I have many worksheets in this particular workbook and they are all formatted the same. Over half of them do this when I try to add new data. I can not figure out what the problem is or the difference in the worksheets that portray this problem and those that don't.