Blog Page now defaults to different page

Hi I am using the twenty ten theme for my new site
https://www.broomeandthekimberley.com.au/blog/
My blog page used to have a list of all the posts with a small summary and the heading on the page said Blog. I changed some of the settings .. I thought they were the reading settings but now if I change them from 10 to 1, the blog page still defaults to the page that has Kimberley Web Design, Great Ideas, Great Design, Great Price and shows excerpts from the posts.

I have been all over the backend and cant find how to access this page which says that it is the blog page but has a different header and different information.

Thanks