Divine Wrath not giving correct ab on two handed weapons

[Kaymon24]

Hello. I was playing around on the PGCC server until I noticed this and am pretty certain this is a bug.

I was trying out a Duergar Divine Champion (DC) and when I held my two handed weapon and used Divine wrath, I would get 2 ab less than the ab of what I should get based on divine champion levels

(Expected: +7 ab increase for DC 15. Actual: +5 ab increase for DC 15. Expected: +5 increase for DC 14. Actual: +3 increase for DC 14)

This only happens when I use a two handed weapon. All other weapons (one handed, dual wielding) work fine. It looks like this bug has something to do with the +2 ab bonus players get with 2 handed weapons, but I am not sure. Please get back to me to confirm this is a bug.

Thanks.