#content alignment problem

I tweaked the classic WordPress Theme and placed the sidebar on the left hand side. My problem is that whenever I view the category page of the blog, the latest post is aligned beside the sidebar, but the subsequent posts seem to run out of place.

http://soccerginseng.com/?cat=1

I think it should look the same in IE and Firefox. I know the content part of the interface is #content in css, which only has padding-left: 50px in a #body with padding-left: 180px.

How to correct the alignment problem?

Thanks in advance 😀