Block with a Weapon Formula Bug

[GunnerZhang]

http://www.uesp.net/wiki/Skyrim:Block

In this page,uesp suggests that Only the base weapon damage of an ENEMY affects blocked damage.

And the formula for Blocked Damage with a Weapon is:

Blocked Damage % = { 30 + 0.2 x EnemyWeaponBaseDamage x [ 1.0 + (BlockSkill/100) x 1.5 ] } x (1 + Shield Wall perk) x (1 + Enchantment#1 + Enchantment#2) x (1 + Potion)

uesp further claims that:

The use of npc's weapon damage instead of the actors in the block calculation is most likely a bug, as creatures do not carry weapons and blocking with a weapon against a creature always blocks 30% times multipliers.

so how to fix this bug?

 

[BlackPete]

For reference:

Link to tracker ticket containing the same information: Bug #20807.