[Mythicmobs] Weapons created with custom damage value does not update it's value after Sharpness enchanting

A standard Diamond Sword will update its damage attribute after enchanting with Sharpness. However, a sword created by Mytic mobs as per below, is not changing the damage Attribute value when enchanted with Sharpness.

    Attributes:
        MainHand:                      
            Damage: 7-9  

PS: Is this only visual bug or Sharpness does not even apply ? ... or any other enchantment ...