Just giving my two cents... I Had the same problem I was trying to change the listing mane, over and over and it still showing the same it was kinda frustrating I even called Airbnb Support, no solution.
I fixed with the next procedure. If you are using google chrome you only need to delete the browsing data. (be aware that all your autofill will be lost and Airbnb website will ask you again for permission)
But once its done everything works perfect and the listing name will be updated as it supposes to. (you can do the same in other browsers like Firefox, Safari etc... )
Hope to have helped you with this approach to troubleshoot the not updating listing names