Delete the Custom Fields from your postmeta table where assigned posts no longer exist.
After adding "Visual editor custom button" plugin it add it's new buttons as hidden post creating a hole lot of custom field. After uninstalling the plugin, I had to delete the hidden post manually in the database. Then "DX Remove ..." let me delete all the custom field it had created.
Using clean install, wp last version, and your plugin does show the 'remove unused cf' under admin, but when i click it it says : warning clicking delete would remove, bla bla bla.
But I see no DELETE button anywhere !!!!!
That's a trick? :)
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