I'm interested if anyone else has noticed this. Some quests haven't updated with the highest difficulty I've run them on. As far as I can tell, I only get this with Eberron Epics.
Screenshot shows that the AC thinks I've only done LoD on Heroic Elite, while the XP Log shows me as having already run it on Epic Normal. I've got several toons like this, to the point where I'm having to manually keep track of difficulties run in spreadsheets.