Textboxes causing cell size to increase

[tshad]

I have two tables that line up correctly.

But when I add textboxes into the cells of my table, and it is close to the
right edge of the table, it increases the size of the cells making all the
rest of the cells get out of position.

I have cellspacing and cellpadding set to 0, and borders=1 (so I can see
what is happening) and I can see a good 16 of an inch space from the right
side of the cell between the border and the textbox. If I add another
column (from 18 to 19), the cell gets a little larger, even though the
textbox is not even close to the edge.

What is causing this and can I stop it?

Thanks,

Tom