I have screenshots. I've noticed ghost XP out of nowhere before though, eg. any time I have __ XP to level up, I will carefully plan not to go over, and then it goes over anyway even though I calculated it all before hand. Now I don't try to get within 10XP of a level up.
Edit: I also had a dataset pushed on me immediately after I opened my game to start the LTQ (don't normally need a data push for a new LTQ), so it is possible that it was different before this. Just a thought.