I’m having the same prob…. and I just upgraded my footer is also linking to another link in sidebar….weird stuff
URLs would be nice. I can’t speak for anyone else, but I’m not psychic. I like to see the code.
This probably means that the sidebar DIV isn’t closed properly.
Try opening the sidebar.php file in the theme and put a </div> at the bottom.
It’s very random this way, but without urls, it’s impossible to tell you what’s specifically wrong.
A great way to debug is always to use Firefox with Firebug 🙂