Archive Pages Aren't Formatted Correctly

Hello all,

I recently widened by blog’s layout from 900 px to 1024 px and everything seems to work well, except for my archive pages.

My category and tag pages look fine, but if you try and go to the archive pages by date, the formatting doesn’t work right. The funny thing is that I didn’t change anything on these pages and almost forgot completely about them until I started checking everything to make sure there were no problems.

RIGHT formatting – http://www.mommylivingthelifeofriley.com/tag/recipes/

WRONG formatting – http://www.mommylivingthelifeofriley.com/2012/02/

Can someone please take a look at my date-archived pages and help me to find what I’m missing? Thanks so much for your help!