IE indentation problem

Hi,

I've built a website for our studio. I made a theme based on garland. I have an issue with Internet Explorer. A node is indented after the summary part. This doesn't happen in firefox. How do I get rid of this indentation? Site: ~ click on portfolio for the indented items which occurs at row with the 'deal or no deal' image. The css I use is at ~

Thanks in advance,

Matthijs