two games Im dm'ing are having this issue. It seems to happen every time we change the turn order in combat. After the turn order moves, a random roll from some NPC or PC sheet pops up, without a player's name attached to it. About 50% of the time, only I (the GM) can see the ghost rolls. It's been consistently 1 random ghost roll every time I change the initiative. There is no roper in this combat, and there is not even a roper token on this map page. The roll did not add a roper to initiative either. The last session they fought 2 ropers on this same map but both tokens have since been deleted fully, and then the first turn of Initiative this happened, followed by roper tentacle attacks at the start of each turn for about 6 rounds, then it moved to other random rolls. (We all had a good laugh Roper illusions that were tormenting them)