I'm an idiot.Dang, I really thought I had this one - in my testing I was able to log in and out and end up with exactly the same HP regardless of where I was (public space, dungeon, etc) or what character I was playing. The missing 135 HP - would that happen to be equal to your Base Bonus HP from combat styles modifying your base HP? There's a new part of the HP breakdown hover-over on your character sheet so you can find that value outright. When investigating this, we found that there were two major culprits to HP loss - the bonuses your character gets to HP from Fate Points and the bonuses they got from Combat Styles. 135 being an odd number makes me think it's the latter.
I have 653 hp, not 658.
So the difference is 130 which is exactly the 25% competence bonus from Vigor of Life.