hi - so sorry you had this bug! only one other person has actually seen this bug as far as i'm aware, so if you do manage to replicate it, please let me know so i can get it fixed for the next version <3
so - i think the action that is causing this is essentially the double click on the "GO" button after beating a round is causing the issue - possibly reopening the shop scene and causing cards to not be removed from the scene properly?