Hey everyone! I found a solution! If your browser has the extension
called "HoverZoom" that is likely the culprit - disable it or blacklist
that site in the options, and ebay should (hopefully!) be back to
normal!
You can count me in as having had this same issue for years now as well.
I've talked with ebay people and they've said it's something they're
"working on" - that's simply not the case. You'd think a website of this
size wouldn't have issues like this...