problem with home page

Hi,

can someone help me, please take a look at this site
http://www.heidistoops.com/

you can see its quite messy… you see the box where
the posts and sidebar are, only when added a post then
the box will go with the post and not with the side bar..
it suppose to look like this with the post and sidebar
http://www.heidistoops.com/category/blog

can someone help me fix it please…

i will greatly appreciate it.

thank you 🙂