Jabu just now tried again 3 games, with 3 different cards.
First is Persona 4, and card from PS3 (.VM2).
Second is Super Bust a Move and card from PCSX2 (.PS2)
Third is Monster Hunter and card from PCSX2 edited with save from gamefaqs using mymc-GUI (.PS2)
- He deleted on saves that he had earlier on ps4.
- Installed games with custom cards
- Run game, loaded save,
- did something in game, save games.
- Then turned off PS4,
- reloaded game after turning on ps4, and saves from previous time loaded just fine.
So for now developer is not able to reproduce that issue at all. I also can't help too much, maybe you had some old saves for that game on PS4 earlier? Really no idea what's going on.