I don't use eBay labels as dealing directly with AP is cheaper and more reliable.
I doubt eBay are charging you $11.51 for a label; more likely that is the total charge for the transaction.
In Seller Hub, Payments will give you every transaction and the fees appertaining thereto. Unless you're selling hundreds of items a week, it doesn't take much time to work out what fees you've been charged.
Much less time than posting on the boards where nobody can change things.