Roblox's Whistle occurrence

So I have reported that there was this player who keeps appearing on my games yesterdayeidsvsnf I went on to record every gameplay after I did that but vnpelo I&announced his shenanigans but eventually he came back, I do not know if this is from the game itself or was Roblox in my device hacked to do such things, but he probably wasn&happy at that time. he never appeared again after