Category post coming up despite not being set in a category

Hi there,

I’ve been having issues working out why 4 posts keep showing up in all categories when they’re only tagged in a few certain categories on the default archive blog post pages:

http://growmybiz-canterbury.com/category/directory/development/retail/

http://growmybiz-canterbury.com/category/directory/legal-issues-to-consider/insurance/

The top three and Kent Invicta Chamber posts, won’t disappear, they show up on all of the search results.
All the other posts to the right and below them change as they are supposed to.

Please can you help me figure out why?

Thanks,

Krissie