Home Page not lining up

I've had a go at using the BuddyPress Fun theme, but on the home page, the sidebar isn't appearing beside the main info.

Best to just show it:
http://inhampshire.com

On the demo site it lines up ok, and I've made no changes:
http://themetastic.com/buddypress/?wptheme=BuddyPress%20Fun

EDIT:
I've noticed that this only happens if I select articles to be shown on the home page. If I select the slideshow, the sidebar lines up ok.