Citadel enforcer or Voldrethar has some bugs

[yasam11457]

Citadel Enforcer's Claymore item has 727 - 1091 damage.
Voldrethar, Dark Blade of Oblivion has 704 - 1057 damage..

When i equip Citadel Enforcer's Claymore my damage is 1702 - 2067 in character window.
When i equip Voldrethar, Dark Blade of Oblivion my damage is 1733 - 2087 in character window.

When i check weapons Citadel Claymore has more damage and more str than Voldrethar. So why my damage is more when i equip Voldrethar than Citadel Claymore ?

[yasam11457]

I am unholy dk btw.

[LocoMeneer]

Weapon speed.