Not really a big bug, seen this quite often today and I think this bug was talked about before, I don’t know if I’m right or wrong but I just look at the player lists and some players have this but fixes when I nexus or go to a other portal. The bug only took place in dungeons.
Edit: just noticed, look at some players like in the last image, Cutie is Jaskper while Jaskper is in the bottom??