Only works in Firefox

My main page http://www.underdogmilitia.net works in Firefox, IE, and Opera. However my recently started blog(www.underdogmilitia.net/blog) only shows the whole page with sidebar and links in a firefox browser. Both IE, and opera will cut off have the page(after about 1 or two posts) and cut off the sidebar.
I’ve spent a lot of time trying to find the problem even checking the w3 validation service.
I even upgraded my wordpress on my server(apache, fedora), no effect.
I don’t want to tell my visitors sorry you need firefox.
Can anyone see what I might be doing wrong.
Any help in appreciated.