i was just in a admin made map (vanilla one) and 3 more trampolines spawned in the same spot as the originals... ive seen this in few admin maps and it can be annoying, (like that little car thing that can go in the air, and other car used maps from admins can be double spawned... and really mess everything up) has this been a long existing bug? if so, please find a way to remove it. thanks for listening. -{Jaedee}-

Yes, this is a long existing thing; it's because of sync change. The sync left the room and was changed to someone else, and their internet was unstable.

What do you mean with "their internet was unstable"? From my experience this happens every time a player gets the sync who wasn't sync before in the round.
Recreatable in tribehouse: Player A is shaman and sync. "/sy player B" so player B is sync, items are spawned again. "/sy player A" so player A is sync again, items don't spawn again.

Ah, right! Sorry about that.