Sorry, I’m just now seeing this post.
I took a look at your site using this – http://mattkersley.com/responsive/ so I can be able to look at the code from the mobile perspective. It looks like the code for the 5th footer widget is missing.
I also noticed there are 3 instances of the footer-widgets 1, 2, and 3, but only 2 for Footer-widget 4……The 5th widget is completely missing. Once you duplicate the footer-widgets they should all show up the same on your browser.
If you can temporarily disable the CSS plugin you’re using to shrink/consolidate your CSS, then I can take a better look at what’s going on.