Others are experiencing this too, you are not alone, and have had to manually mark the item as dispatched.
Can you do this ? You may need a laptop / PC and not the app or mobile browser.
If not, contact eBay Customer Services they'll do this for you. Their lines open at 8 a.m.
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 8 a.m. - 10 p.m. on weekdays
9 a.m. - 6 p.m. on weekends.
Automated agents will be available on chat outside of the above hours.
I recommend contacting CS first thing in the morning as there's more chance of Dublin answering.
@jo386906
