There is a known problem involving unlocks saving when unlocked, so I bought a deck key just for mana mastery. So basicaly I HAVE ALL THE 30 UNLOCKS every restart, but it will not save any add/remove changes in the deck manager for that deck.
I have tried to disable cloud sync, I tried making changes to other decks after making changes to Mana Mastery and then restarting, but nothing works. I even tried the "Deck Pack 3 Unlock Issues Temp Fix" by Providence and it doesn't work either because all it does is give you the unlocks, it does not fix the deck editing issue. I hope this is patched soon, it's really annoying going into the deck manager and adding/removing cards to set my deck up every time I restart the game.
If anyone is having this exact problem and reading this, please let me know. I feel like I'm the only one.