This is my page with only the header row of the table:
When I start adding rows, everything looks good, until I add row 13. Here is an example:
You can see the header (the grey box) "wiggles" just a little bit. I thought there may have been an invalid character or something in the 13th row, but as a test I duplicated the 12th row and the wiggle still happens!
Surely this doesn't have anything to do with the number of rows, but can anyone see what else may be going wrong?