Good morning .
I could be wrong, but what you are describing sounds like a backup error.
for some unknown reason your game has loaded a save from before your progress.
In the hypothesis that I am right, your games have returned to the moment when your exploits have not yet taken place, hence the loss of your enslaved NPC and your advancement.
To prevent any backup errors, I advise you to make copies on the PSN cloud and USB key.
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