New Legendary Heros.

We have had issues with these not gaining experience from attacks. This seems to be partially solved.
They are now gaining experience from attacks, However it now seems that when they get to level 100 they again stop gaining experience from attacks.

The only way then to level them up to 120 is to apply Anabasis/Epitome/On War.

Is this how they are supposed to work or is this another glitch?