The damage bonuses for double weapons wielded in Both hands as a two-handed weapon (i.e. not as a double weapon) are not including the 1.5* strength and the 1.5*power attack. Double weapons act as two-handed weapon when not being used as a double weapon. This error occurs with the "Both" option checked or not. Note: the bonuses for a double weapon appear correct when using it as a Double weapon (half Str and half PA with the off hand).
Re-create:
create a fighter with at least a +2 Str bonus
add the Power Attack feat
add a two-handed weapon (greataxe?)
add a double weapon (orc double axe)
See bonuses on greataxe = 1d12+3 (1.5*2=3)
See bonuses on double axe = 1d8+2 (1*2=2)
In the in-play tab check power attack.
See bonuses on greataxe = 1d12+6 (1.5*2 (str) + 1.5*2(PA)= 6)
See bonuses on double axe = 1d8+2 (1*2(str) + 1*2 (PA) = 4)
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