problem with category post lists

Hi There,

Can anyone please help me? I’m not a whiz at code, but can manage if someone instructs me.

I’m having problems with my category posts. It just happened all of a sudden and won’t fix itself. Instead of being displayed as a list, the whole post is turning up on the wall. It’s not the theme because even when I switch themes I’m having the same problem.

The site is http://www.thepilgrimproject.org

Thanks so much.