Problem with IE

Hi, I have a little problem in IE where if I click on a certain category in my blog, the post gets pushed all the way down below the sidebar. I have no idea what the problem is and it only seems to happen in IE and only in certain categories.

This is my site:

https://the250.net/

And here is the problem when you click on the the “animation” category:

https://the250.net/?cat=2

as opposed to the “western” category:

https://the250.net/?cat=3

Any suggestions?

Thanks!