Unknown page using required URLs

Hi,

I’m looking to create a category page with custom URL. I want the URL to be:

http://revolutiontea.co.uk.gridhosted.co.uk/organic-tea/

However, there is already random content appearing on this page. It’s not a page or post that exists and I have no idea how to remove it and free up the URL. There are several URLs like this.

Please help, spent hours trying to figure this out.

Thank you!