Editing post messes up theme

I’ve never had this problem before, but I edited a post of mine, and it sent the entire theme out of whack. Here is links to some screen shots I made

http://img229.imageshack.us/i/error1e.jpg/

http://img215.imageshack.us/i/error2i.jpg/

Could it be because I’ve just switched from firefox to google chrome?