Can’t find the access. Can you please provide a temporary access using this plugin: https://wordpress.org/plugins/temporary-login-without-password/ which will generate a link to login to your site without a password. Just share that & it’ll be all. Also if possible if you can give us a temporary user access with products added to check that out.
Check if you’ve created the edit ad page with the proper page template: https://prnt.sc/r1cfhz
Also check on theme option under pages tab the template is chosen: https://prnt.sc/r1ceqv
Regards