3rd level character with 3rd level Bonesplitter 2-handed axe. Strength 16 with 1 point in 2-handed weapons.
What shows on the UI and info-pop respectively:
Basic Attack (2AP): 25-29 + 4-5 Air
All In (3AP): 24-28 + 8-9 Air
Not used All In yet, it may just be displaying incorrectly, but it looks like it's not adding the Strength bonus