@bgervilliers, this has been reported a few times in the past, and unfortunately, we have not been able to identify what could be causing this.
We suspect, it may be because of interplay between plugins.
Things to try:
1. Uninstall this plugin, and reinstall it: We use standard wordpress configuration setup, uninstall usually removes all entries and a reinstall should enable you to start fresh.
2. View / Clear the configuration in the backend.
- View
select * from wp_options where option_name = 'facebook_config' limit 1 \G
- Delete:
delete from wp_options where option_name = 'facebook_config' ;
If you don’t mind, can you try option 1 first, and let us know if that worked. Option 2 should work, but needs access to your database. Additionally, can you share if you have any other facebook/pixel based plugins.