It's probably a result of either:
• tables being merged; or
• selecting only some rows when adjusting column widths.
In this case, the simplest solution might be to:
1. position the cursor in the first cell on the last row and press Ctrl-Shift-Enter, to split the table there.
2. position the cursor in the last cell on the last row of the 'previous' table and press the Tab key to create a new row.
3. copy each cell's data from the table containing the old 'last' row to the new last row.
4. delete the table containing the 'old' last row.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]