This is an issue affecting other sellers, you are not alone.
Contact eBay Customer Services and ask them to add your account for the technnical teams to add to their ' bug report' hopefully , this may sort it for you.
Lines are still open today for an hour, but I would recommend waiting until tomorrow morning when the lines first open at 8.am. contact them then, as there's more chance of Dublin answering.
To Contact Customer Services it's a Live Chat, or you can select to speak and request a Call Back. Click on this link:
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
On the left sidebar you can see Have us Call you or Chat with Our Automated Assistant.
On weekdays lines open between 8 a.m. and 10 .m.
On weekends they open between 9 a.m. and 6 p.m.