Duplicate category on category pages

Hi There,

I’m having an issue with category pages on my website. On the category pages I’ve got duplicates of the same categories again underneath the first lot.

Please see this link for the issue: Here

I’ve checked with WooCommerce and they’ve verified that it’s not a WooCommerce issue. I’ve switch the theme to Twenty Fifteen and I don’t get duplicates.

I can’t see anything in the php that would cause the issue either.

Could you please suggest how I might be able to fix this?

Thank you!