Ah just realized you have set the rating range to - 2900 or 3500, thanks for this .
yes i upped the max limit to 2900 for this specifically ))
fix for hypervariants showing in standard group is incoming.
about the games, hard to say without knowing what the person did who created the game.
it is possible to dig up any game in the archive and play it again. so if an admin plays a position rated (likely forgot to make it casual), people might be able to play that.
I saw a 2 player game from an unlisted position, with the same name as a listed position that was listed.