Post not displaying properly

Hi I have several blogs using this theme but one of them is not displaying the posts properly

This is how the post should be displaying

http://interests.staceymercer.co.uk/blog/

But this is how they are displaying

http://staceymercer.co.uk/blog/

I have changed quite a bit in the css, but not anything to do with the posts and the displaying of comment bar and date, author, categories parts.

I can’t figure out what’s gone wrong.

Please help!!