Poor Leander. Try to visit the Valhala (where you trans) and talk to the professor npc, he should rectify the situation, if not try talking to the job manager. If neither does the trick, make a ticket (but the first one will probably solve it).
Berserk/Frenzy sometimes doesn't fully heal.
Here, it tripled my maxHP, but~
It was in DG map ~11:17am of March 30th, server time, in case you need to see logs.
Happened also in previous ToH, once in the 1st monster round (them rabbits!) and another during item trial.