Why am I getting charged on eBay? (10pts)?

I recently sold a few items on ebay, about 4 things for about $15 each. When I listed them there was a promotion stating that selling was free on eBay mobile so that's what I did. When I was posting my items it still showed free next to everything. I know that charge a selling fee after the item is sold, but... show more I recently sold a few items on ebay, about 4 things for about $15 each. When I listed them there was a promotion stating that selling was free on eBay mobile so that's what I did. When I was posting my items it still showed free next to everything. I know that charge a selling fee after the item is sold, but that was deducted from the sale. For example instead of getting the $15 I charged for the item I would only get $13.50 or so. But now I have an invoice saying I owe $5? I know that's not much but I still don't want to pay money I don't owe.
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