I've found this issue too. Not with bows, but single weapon.
Madora use a two-handed sword 28-54 and does 35-50 damage per hit.
I use a single weapon, sword 24-36 and do 8-10 damage per hit. (I even find a knife 22-32 with which i've done 3-4 damage per hit).
But monsters aren't bugged at all, even with single weapon style. They hit me hard 15-30 damage per hit even with a good armour resistance : 31.
