Last Sunday I manually set my character's level a bit lower (to 3) so I could retrain a feat and have it appear in the character list at an appropriate level*. After putting the level to current (4) again, the HP values were all kind of messed up. Max was showing at 58 although it was supposed to be 74. I tried leveling down again and then increasing it via the character tracker, but it seemed to always have the HP at the correct value for the level that was set prior to the current level setting. After trying a bit it sometimes showed correctly for a second or so while then reverting back to 58 max for some reason. We also managed to somehow get the current HP to 74 and the max HP to 58, which I think happened when the amount of damage/wounds was changed.
I
recorded a short video (no sound) where I recreated this, also displaying a different display of HP between GM and player. In order to get the desync between max and current you just have to change the damage value at which point the current hp will calculate correctly, but the max HP will still be at an incorrect value - I forgot to record the latter part though.
*I know now that you can adjust that manually, but I didn't back then.