I don't know if anyone else experience the same but this is wired. I was LV 13 gladiator, physical level at 19. When I leveled to rank 14 I found my maximum HP decreased from 1016 to 1001, MP decreased too but can't remember how much. At first I thought this might be the damaged gears, so I went back to limsa, repair everything including accessories (although they don't have bonus on HP) but HP remains the same.
I hope it's not some stupid noob question, apologies if it is.