I did a google search and found some threads that mention this issue. I didn't look at all the results, but one mentions using the back button helped:
https://community.ebay.com/t5/Archive-Selling/Problems-editing-anyone-else/td-p/24385277
Just looking through the search results it looks like it has happened to quite a few people going back a ways. I know that's no consolation.
Someone else mentions "You need to clear your history, cache and cookies and that will fix it." But I saw threads where people said they tried that and it didn't help. Maybe you could try though if you haven't already.
