Pagination causing duplication (SEO Error)
A user clicks on page 2, 3 etc to view the second or third page of results.
This is OK, however once a user is on page 2 or 3 and then clicks on '1' to return to the first page, the URL is for example:
This URL is a duplication of the first page, which is:
I haven't tested yet, but I presume the same would happen for every category, causing multiple duplicate pages.
My recommendation to fix would be that the '1' links back to the parent category.