Sounds like the version of Safari that lots of folks have with iOS 15.8.8 no longer works with eBay. Possibly other browsers as well.

If that is what you are encountering, I would suggest reporting the issue to eBay directly using one of the "Tell us what you think" browser links from one of the affected My eBay pages, then trying other browsers to see if one works better and posting the detailed results here of which specific browser versions have been tried.