How to remove sub-brand from Listing

Hey Guys,

On the product detail page of one listing there has been added the term sub-brand. The listing is under our own brand. But the sub-brand is under a different brand which can create a lot of problems.

How can I remove it?

I‘ve tried looking for it in flat files under our category but did not find anything. Is there a different method additionally to opening a case? Sorry for grammar, not my main language.