Not sure how it's done but it seems when you change mundud stones the old one doesn't drop and you can stack 3 stones effects. I know this happened on pc awhile go as well. So just bringing it to attention increase it hadn't been reported.
Did you report it in game with a Bug Report ticket as well ?
Might be a display issue rather than a genuine stacking of Mundus stone effects ... does it carry over between logging out, closing application, and then relogging ?
It might appear on your character sheet buffs list but does it also change the stats as it should ?
sorry just pretending to be in debug mode
Everyone knows the phenomenon of trying to hold your breath underwater - how at first it's alright and you can handle it, and then as it gets closer and closer to the time when you must breathe, how urgent the need becomes, the lust and the hunger to breathe. And then the panic sets in when you begin to think that you won't be able to breathe - and finally, when you take in air and the anxiety subsides...that's what it's like to be a vampire and need blood.
Francis Ford Coppola - BS Dracula: The Film and the Legend