What’s a random fanfiction pet peeve you have that you don’t see a lot of people talk about?

For me, it’s when authors capitalize words just because they’re terms that are unique to the media; if it wouldn’t be a proper noun in-universe, it shouldn’t be capitalized in your fic, goddammit!

For an example of what I’m talking about (bonus points if you recognize the fandom), I see the term “nindroid” capitalized so frequently. Nindroid is basically just the in-universe lingo for android, why would that be a proper noun?? “Human” isn’t? I also see it sometimes for “vengestone”; that’s literally just a fictional mineral, why are we giving it special treatment lmao

Admittedly I’m exaggerating about how much this actually bothers me, it’s a pretty small gripe and definitely not enough to make me drop a fic by any means, but it’s extra common in the fandom I’m in right now and I’m wondering if anyone else has noticed this. Maybe this is just a me-thing.

So what are your guys’ obscure pet peeves?