After a reinstall, I can re-do completed quests and re-loot objects

[Endir]

After a pause of more than 2 years, I wanted finish PoE for good before the upcoming sequel. So I installed the game again.

Except, I could battle Maerwald again, gain the same ability a second time... and I can loot objects that I looted before when I did the dungeon (like Hand and Key armor). 

It affects other places in the game as well, not just the keep. The quests are still marked as completed in the journal, but I'm afraid of breaking something permanently and lose more than 100 hours of play...

 

So, what should I do?

[hilariuspdx]

I am experiencing this as well! Fog of war is back on completed maps, all chests are re-lootable, and upon return to Cad Nua, the Battle of Yenwood Field is once again at my doorstep even though I had completed it. I did NOT reinstall like the OP, and was at the Abbey in WMII when all of this started about a week ago.

[Asccs]

Two versions of everything! That's an interesting bug