Dynasty weapons.

I have a sword equipped, and I've checked all the available tabs, both passive and active. I have a hypothesis about this, but it needs to be verified by leveling up other weapons for a clean experiment. It might be a bug in SOUL FORGE; I think I_N and Garnet wrote about the same thing. I put the Griffin Sword in the forge when it was at level four (it was just short of level five), as it should be, and after two weeks, it leveled up to level five, but in the dynasty/weapon dynasty tab, the points scale wasn't completely filled – 13.7 million, the next level is 15 million, although the maximum level five is 7 million. Here, below the scale, all five levels are shown as active, and in the game, the first four levels are also visible in battle, but Griffin's Fury is not.
I just checked again: no more points from battles with this sword are being added to it; i.e., it remains at 13.7 million.