I posted about this before, but I have now confirmed that whenever I have a weapon or ring equipped (I haven’t tested clothing but I assume it’s the same issue) that has the negative effect of reducing max HP by any percent, my HP gets halved whenever I enter the game, it happens in any realm as long as I have any equipment that reduces my max HP.
It feels tedious having to either use up a healing item or unequipping my gear before I log off just to prevent the HP drop (and sometimes I just forget to). I have a weapon now that I love to use except for this. It almost ruins it.