I don't know if this is a bug, but happened to me twice, probably there's a reason for this. The problem is whenever i cleared the dungeon monsters inside and go out to quicksave so that i could load again whenever i die. But when i die inside and reload my quicksave with monsters cleared, whenever i re-enter the dungeon the monsters I've killed were reset. Why is this happening, is it bug or was it done in purpose so that you have to go in and finish the dungeon all the way? It's in normal mode by the way.