The Panopticon/The Master templates

This category is really confusing me. My own user page has the category, with no way of removing it, but I have no idea what? It appears to be because it uses the Reborn Master/Missy and so on template, but it can't be really, because there are so many articles that use those templates and don't have the category. I've linked some articles that have it.

What's going on there then?