eBay fees adding up to 75% of gross profit

I sold an item with a gross profit of $20.40. eBay charged 20.8% for whats supposed to be an 11% ad fee and 28.7% final value fee which I've heard is only supposed to be 13.5%. After shipping label and regional taxes eBay has taken over 75% of my gross profit. Why has eBay overcharged on ads and final value?

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Fees are based on the full transaction. That means the total the fees are calculated on includes the item price, the shipping (with some partial exceptions), and the tax (if applicable).  So if you sell an item for $20 with $20 shipping + tax, the fees will be calculated on $40 instead of $20. If you have promoted listings turned on, you might also get additional fees from that (again, on the item, shipping, and tax).