That isn't intentional according to Popcorn and he's trying to make a fix for it. He told me until his say-so not to enchant costume weapons.
Oh i meant the enchant glow effects from Main/IM slotted weapons make their way onto costume weapons for some reason even when the costume weapon is completely clean. I think having the costume weapon showing it's own enchant glowing effect is a good thing since we can choose to keep it normal for no effects or enchant it to our desired enchant glowing effect.
Any possible way to make the costume weapon completely override any glow effects from IM/Main slotted weapons, like how a clean IM weapon in the IM weapon slot will not show the glowing enchant effects of the +20 main weapon that it overrides.