Hi! I’ve seen this issue myself! It seems to be a very illusive bug, and I don’t believe it’s been fixed because of that. Help and Questions - #170 by richard
Here @richard said that it might fix itself if you drag another tilemap on top of the broken one. Apparently it worked, so maybe try that? If the issue continues I would just try to delete that tilemap? Idk if it will let you with the weird cursor-stick bug. A lot of people have seen this bug, so if you have any idea what you did to create it please share so that the mods might be able to fix it!