(edited by Neil.6138)
Missing total HP
Since you mentioned, WvW , that made me think of the world bonuses, specifically "Robust" for health boosts. Perhaps that has changed on your world.
It’s just an idea, *shrug*.
Good thinking.
I have spent most of time time recently in WvW acquiring tokens/karma for gear upgrades for a survivability gain and have kept a keen eye on it. Do not have a visible notification of buffs relating to world bonuses in the video.