I think that because when they integrate a new character (anna in ver xxxx) they put it with 100 lp and 50 kp because they have no events, but in new versions they add events (the events establish the LP max and KP) I think xd
because I have verified it in the previous versions that I had saved (hanna in the xxxx version lets me put it at 100lp but in the new one at 60 and I already finished all its events