This has been happening on and off on my 4-year-old iPad Air (trying to order a new one but our carrier says they are out of stock). I always work on my Etsy shop using tabs on my iPad browser. I take and import all pics from my iPad. I use voice-to-text. Love the setup!
I can paste changes to my listings on my PC. Go figure.
I didn't find this exact issue in my search of the forums, but it seems possible that editing may work properly if I switch between "old" and "new" versions, or use the app (not a fan because of past experience but willing to try).