Hidden Fields affecting spacing?!?!

Hi guys…this might be a simple problme or mu stupidity!!

I have a table,simple, with approx 4 rows, 3 colums, they are all spaced so that they are close together, the last colum has a paypal buy now button in each cell,the cell height is the same as the button as i want it to just fit in.

Thats all fine, table looks fine when previewed.

However when I add in the paypal coding with all the hidden fields, the fields cause the table to change size and when previewed there becomes larger spaces between each row.

go to the vouchers section of my site and you’ll see what I mean, the different haircuts should be closer together


Any ideas how to rectify this, I’ve tried setting the cell height but it doesnt work.