We have no access to your account but could be a number of things.
Do you buy postage from eBay? Could be the deductions for the labels.
Have you added any of the following to any past and present listings. All the following optional listing upgrades come with a non refundable listing fee, payable sale or no sale, and charged the second the item goes live.
Reserves: 4% of the set reserve ( maximum £150 per item)
Subtitles: £2
Listing in 2 catagories: 35p
Gallery Plus: £2.50 ( free for clothes and shoes)
Listings with duration 1 - 3 days 35p
As a tip, before clicking on the final List Item With Displayed Fees button, glance just above it, it should read £0.00 Listing Fee.
If there is a fee amount listed there, you have selected an upgrade, and if you wish, it gives you time to scroll up and remove the payable upgrade.
All your transactions will be shown here with breakdown of any costs / fees
https://www.ebay.co.uk/sh/fin/transactions
@markrsturbo89