Applying weapon enchant in wardrobe error

I can use my lightning emblem on the top melee weapon but when I try to use it on the one underneath it I get the message saying it must be used on a different type of item. They are both the same weapon and I've tried different combos but nothing seems to work on the bottom melee weapon (assuming its the offhand weapon). Am I doing something wrong or does it just have a kink in it?

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Applying weapon enchant in wardrobe error