Single post error

I have two different types of single post files. One called single-exhibition.php and one called single-normal.php.

When I go to visit any of my posts the page is showing only one particular post, not the post that the URL is showing.

I have tried to post outside of the category of the one that keeps showing, but still no luck.

Here is a link – http://www.2queens.com/newwp/exhibition/, click one of the titles to view a post and notice the above issue.

Here is a link to the post outside of that category (exhibition), which still only shows the one particular post – http://www.2queens.com/newwp/uncategorized/test/

I hope this makes sense.

Thank you in advanced for any help…never had this before.