found I had added one I had completely forgotten about, and was sort of staring at it in horror

LOL, I think that happens to quite a few people -- you get caught up in offering as many fandoms as you can, and while in the moment you think that you'll be fine as long as you've heard of it, but then later you go, "Wait, no, I offered this? Ahhhhhhhhhhhh!" But I'm glad it's worked out!