After leveling up my Sovreign I noticed that, consistently, upon leveling up the leader received an essence bump of 5 points. All well and good. The normal screen, and main map icon, reports 5 essence less than the "level up" screen.
It wasn't just a one turn delay either. After multiple level gains the "level up" screen consistently has the correct total while the normal screen reports 5 essence points fewer than it should.