Every time i copy a listing to make a new one, i edit all the title and description and it just reverts back. This has been going on for a while now and it's wasting my time typing it all up again. It happens on my phone. I've un-installed etsy seller app and reinstalled and it's still doing this. I've been listing on here for many years and this never happened to me before.
The app is not the best to-do listings, using a web browser is best, I copy listings all the time using Firefox (on Windows PC and Apple iMac) and have no issues with titles and descriptions reverting back to the original text. If you do not have a PC to use a web browser mobile app instead of the Etsy seller app, Firefox, Chrome, etc, then log in to Etsy and create your copied listings that way.
Use a browser instead
I copy an existing listing all the time to set up a new listing as it saves so much time. I have learned to get it to take and not have to keep redoing it, first copy the listing and save it to drafts. Then go to it and hit edit and make the needed changes and publish your new listing. I was having problems with changes taking till I learned to always do edit. Hope this helps.
I had the same problem with the app, and it stopped happening when I instead uploaded the new photos first before making any other changes to the copied listing.