I'm sure you're aware there has been an issue with people/bots spamming CP on some lemmy instances, I'm not sure if I happened to see them before removal, or if removal still isn't federating properly (since I know the admins/mods have been trying to implement additional solutions), either way, these posts were still showing up on all/new last night/early this morning (GMT), so it might just be worth double checking on your end if there is any way to stop this.