The ones who repeated witches house were all adjusted when we became aware of the issue a few months back.
If there is a new bug, I'm unaware. Its easy enough to look up who has repeated quests multiple times.
Pm me if that's the case and we will look into it.
It's not a bug. Your adjusting quest xp to rsc rates. giving those who done them before the change an edge over those who didn't. Look at demon 13 as an example. He's like 60 60 60 49hp. He was only able to do that because of quests. You change the exp that's obtainable from quests and no one else could ever get close to that.