Possible Arc Warden bug

Possible bug for Arc Warden depending on how you interpret the description.

Had an early warden 3 star today and the math wasn’t adding up with Crystalys. After thinking about it I think it has to do with how the math is programmed.

ARC 3* has an attack damage of 160. Each clone does 50% less damage and gains 20% less mana.

If you put Crystalys(+25 Dmg and 20% Crit Chance for 200%) on ARC 3* the first clone is -67 dmg.

So the damage is figured after the +25 is applied. Wouldn’t the description of Copy Arc Warden’s item mean that the +25 is applied after the -50%?