Dios skill tree bug?

So I keep seeing those few Dios that have both Devil Force and Weapon Force, and yes, they have the full skill tree like: WF Combo, and Evil Eddy.
Does anyone have any idea about this bug and how can I do it too?
Much appreciated.

I made this build once
You have to give up just about all passives and you can reach half of WF or half of DF while still having the AP boosts