Are those cards automatically unlocked for patron supporters if they put in the cheat code? Because I haven't purchased any of them and they're all revealed for me, which means the cashier's love meter is stuck being empty.
No, only if you used the cheat to open the entire gallery. But then you will also have the scene with the seller open. If you did not use the cheat, then maybe there was a bug, and they opened. In that case, you can send your last save and the persistent file to me in a private message on Discord, and I will manually close these cards for you.