I am currently testing a client website, http://www.tregreekboutique.com/zencart, and have noticed when logged in with a test account I created and continuing to navigate or shop the main content of the page shifts to the left and throws some images out of whack.

I'm not sure what could be causing it, since it only happens when a customer is logged into their account. Otherwise the layout is fine.

Has anyone else run into this issue at all or know what the issue could be? If so, what was the cause and solution?

Thanks!