Old posts and sidebar not displaying?

I just installed Atahualpa today, so I'm on a steep learning curve! It's a great theme and very user friendly.

I do have a problem though, when I click on my "News" section on the first page I have 10 posts and a right hand side bar (which is what I want). If I click "older entries", I only have 2 posts and no side bar and I'm not sure why? I can find the older posts if I go through archives, so they are still there, they are just not displaying when you try and browse older entries from "News".

http://understandingcancer.co.uk/news/

This is the page with only 2 posts on:

http://understandingcancer.co.uk/news/page/2/

Any suggestions?

Thanks