incorrect info on customs form costing customer

Why did eBay list my trading card as “metal” on the customs form and cost me an additional $50?

There is no metal in a hockey card. Literally zero reason or logic to list a non metal item as metal. Now it’s a huge problem to get reimbursed and will be months if ever.
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I do believe it is the seller's responsibility; not eBay, to fill in the correct customs information...