Description: If any cell in a row of a simple table contains smaller or larger text then an extra empty cell will be appended to the row.
One column table with simple table syntax:
workaround: use advanced table syntax.
Note: this bug may be related to PITS.00437 (percentage symbol % adds extra cell to table).
Superscript in a simple table cell may cause this bug as well sometimes, but I could not replicate it here.