front page sidebar problem

On my website studentoncampus.com, the sidebar changes in size width ways when changing from the home page to other pages.

see the homepage https://www.studentoncampus.com

and then a random page in the site https://www.studentoncampus.com/get-involved-at-student-on-campus/

If you look at the tabbed sidebar (popular, comments, featured, tag cloud) on the random page you will see that everything looks fine. But when you are on the homepage, the tabbed sidebar is right at the end of the page.

Although this is a small issue, it is really annoying me.

Can anyone help??

Thanks.

Ace