Anything with this seems to look out of place, but like @Paulie_D said, if you inspect it with Chrome Inspector Tools, your footer is fine, however your header isn’t and also the sections of content as they both are using the row property.
I’m pretty sure (from what I remember) that rows should only contain divs with classes of span-x and you can’t ‘wrap’ divs which have those classes. So, for instance, you have a ‘nav’ with no class but your div inside that (why a div?) has a class of span-9.
Why haven’t you just applied the class of span-9 to the nav?
Your menu is just plain odd…why are you using divs instead of a list?
Without getting into it too far, I suspect that the styles that you have in the head of your page are impacting on the base styles of TWB and causing the issue(s). For instance, there is no need to define a width of 940px to the page-wrap, just give it a class of ‘container’, that’s what TWB is supposed to do for you.