The issue is in the header and footer of the site, which have several HMTL issues. That's the settings on this page.
In the site header box you have two issues:
These lines need to be moved down to the box that says
Custom Code For HEAD Section
And then the <head> parts should be removed so that it look like this.
In that box the header starts with an open paragraph tag.
But there is no close for the paragraph formatting tab, so it is applied everywhere. To fix it, in the bottom of that box add a
That's the header.
For the footer, it is set into a table that is hard coded to be 918 pixels wide, but again the table tags are not closed.
<table align="center" cellpadding="0" cellspacing="0" style="width: 918px; margin-bottom: 0px;">
At the bottom of the footer box you need to close those tags. Add in
That should fix the broken HTML. The footer is still hard coded to 918 pixels, and that still might be a problem, but let's get the broken HTML fixed first and see if that is enough to fix the issue.