For some reason, keys keep disappearing from my inventory.

This has already happened 3 times this playthrough, and the only solution I could do is loading my older save files.

And to make matters worse, I started monitoring the keys during my playthrough, and figured that not only does it disappear, but it also gets deleted from the earlier save files as well ! making progression in the game impossible.

Now I can't end day 2 even though I paid the 20 reals and it's past 9pm.

I also started a new playthrough on a new save file, and it kept happening.

I really hope someone knows a solution because I do like the game and want to finish it.