I have only three custom fields setup using your plugin.
For some reason, one I deleted always stays and is always in the back-end of every product.
I can’t change it nor delete it because it doesn’t exist under “Custom Fields” then field groups, yet it shows up for my product.
I have deactivated and deleted the plugin and re-installed, yet when I do so the issue is still there.
maybe if I can find where the actual custom fields are stored I can delete it that way.
https://wordpress.org/plugins/advanced-custom-fields/
Had a similar problem a while ago, a folder acf-json was created by the plugin within my (child-)theme folder. It contained .json files which are used as a cache and were not updated after delete in backend.
Deleting that folder acf-json by hand fixed the problem.
This folder is not there and there are no such files on my end.
This is a common problem that goes back a long time that has not been addressed yet and I see no recent responses from the author.
