Hi @tuskotrush
Have you tried to change the hook? Also, could you please try the solution I gave you before. If that doesn’t work, I think the best way to investigate it is for you to open a new ticket and provide temporary admin credentials to your staging/development site. You can open a new ticket here: https://support.advancedcustomfields.com/new-ticket. Also, please don’t forget to explain the issue again and provide the link to this thread.
@hzp
Maybe the update process was interrupted, somehow, so the fields are not converted correctly. Could you please check the difference between the posts that have the fields deleted and the ones that are not on the wp_postmeta table?
@sethsgr
It’s possible that there’s a JS conflict on your site. Could you please try to reproduce the issue on one of the WordPress’ stock themes (like Twenty Sixteen) with other plugins deactivated? If it disappears, then you can activate the theme and plugins one by one to see which one causes the issue.
Thanks 🙂
