Set your inventory option from “Short by” to “Not shorted” and you will be able to solve your problems.
If the issue persists clean a slot from your gear wheel and drop the piece you can’t equip. Then access the dropped loot bag and add that gear item to your weapon wheel to either equip, store to a storage and transfer to a thrall or work bench. But during the add process from the loot bag to gear wheel avoid adding or passing the target items from or to your inventory.
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