This will show you the breakdown of fees taken and money sent to your bank account for each transaction:
https://www.ebay.co.uk/sh/fin/transactions
If that fails to give you the answer, then contact eBay Customer Services, they have full access to your account and can explain any charge / payment for you.
To Contact Customer Services, I find the quickest way to contact them, either for a Live Chat, or you can select to speak and request a Call Back, to click on this link:
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
On weekdays lines open between 8 a.m. and 10 p.m.
On weekends they open between 9 a.m. and 6 p.m.