ie8 main column goes down

I have a two column design with 800px width, right column is removed.
After adding an item to the basket, i go to Basket page and it shows main column's content at the bottom. It looks ok in Opera and Firefox but only in ie8 i have problem, i didn't try older versions.
Is there a way to fix it??

Thanks.

Have you checked the ie6.css stylesheet that it has the same definitions as stylesheet.css?

Thanks for the reply.
I checked ie6.css after your post and could not fix from there. Then i changed the containers' widths, then it showed on normal place but still with small misplacements.
I will check css files from the start to see better.