With no access to your account it's impossible to tell.
This will show you a breakdown of all your transactions and any fees / promotions added , paid.
https://www.ebay.co.uk/sh/fins
If that doesn't clear up the issue contact eBay Customer Services, they do have access to your account and can explain any charges for you. Their lines open at 8 a.m. to day.
This is the easiest and quickest way to contact eBay Customer Services, for a Call Back option.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open between 8 a.m. to 10 p.m. on weekdays.
9 a.m. to 6 p.m. on weekends.
I recommend contacting CS very first thing in the morning, when the lines first open, as there's more chance of Dublin answering.
@sal-71312