It seems like when I use It Belongs in a Museum a lot I end up leveling up when my xp bar does not look full. Is that a bug? Does anyone else see that?
When you level up, the bar changes to the exp needed for the next level, but won't put your current exp back to zero until after you select a skill, so it looks like you have ~half exp if you check it before selecting a skill. Not sure if that's what you're seeing, but I've noticed it on pretty much every level up regardless of method.