Opponent used Sheltered by Ghosts on one of my creatures. I killed the creature enchanted by Sheltered to get my creature back. However, it does not come back. There is a blank spot in the battlefield that was supposed to be for that creature. Then in game 2, my opening hand is missing a card, which I believe is supposed to be the creature that did not come back in game 1. Also for games 2/3, it seems there was a domino affect from this bug that caused the stack to stop showing in the UI.