Without seeing the actual template it is hard to say what the problem is, however, looking at the other shopping cart screens you have a section in the footer area that contains the 3 sections Created by:, VON Statements:, and Blogroll: but in the image you gave the link to those fields are in the header. This makes me think that you have mismatched start end tags for a table, div or other html unit.
First thing I would do is to save a copy of the html generated for the page and run it through an html checker like the one at http://www.htmlhelp.com/tools/validator/ or http://validator.w3.org/ and see if they report mismatched tags.
I would also try using one of the bookmarklets that display the layout of the page. I use the ones at https://www.squarefree.com/bookmarklets/webdevel.html, in particular the show blocks, topographical view and topo with borders. These are snipets of code that will use the browser to display graphically how things on the page are laid out.