Exiting from menus and loading into a new area causes the really loud "bing" ...

I started experiencing this bug today. When I complete a quest, it's like the regular "close menu" sound effect has been replaced by the "quest completed" sound effect. If I load into an area? Quest completed sound effect plays. Close the map or menu? Quest completed sound effect. Load a bugged save? Quest completed sound effect.

I've tried reverting to an older, non-bugged save, but the bug just winds up happening again anyway. Nothing I've tried has fixed it.