Barbarian Damage Wrong?

[ronlugge]

So I don't want to file this as a bug until I'm sure that there's something wrong in the system, and it's not me missing something important. I have an animal instinct barbarian, level 15, whose totals are 'wrong' when raging, and I don't know if I'm missing a detail or if the system is doing the math wrong.

When not raging, my fist does 3D4 + 11 damage, which breaks down accurately to +5 from strength, +6 from greater weapon specialization.

But when I turn rage on, things get... weird. My regular fist now does +12 damage, one short of what I'd expect: +5 from strength, +6 from GWS, and +2 from rage. My Ape fists are worse, with +25 damage, which is over by 2: +5 from strength, +6 from GWS, and +12 from instinct specialization, for a total of +23.