Sidebar in wrong place

Hi all,

I’m having some difficulty with the sidebar. On the home page (http://colgatetridelta.com/), the sidebar is where I want it to be. Directly to the left of the main text content, and below the yellow bar. However, when you go to a different page, such as a post (http://colgatetridelta.com/?p=1), the sidebar is pushed way to the bottom of the page so it is next to the comments section.

Any ideas on how to bring the sidebar back to it’s correct position?

Cheers.