Hello Laura

Thank you for reaching out to us.

Please provide me a temporary WP-admin (administrator) user for your site where this happens, so we could log in and take a look ‘from the inside’ as that’s the most efficient way to see and resolve the issue. 

We do not interfere with any data or anything else except for the plugin (in case that’s a production version of the site), and of course, we do not provide login data to third parties. 

You can write credentials here just check PRIVATE Reply so nobody can see them except us.

Hey Laura

You can't use the "Users see and edit only their own data" with a custom column like "Naam" is. You would need to use the same column you configured as the "User ID column" here:

If I configure the "userid" column the same way you configured the "Naam" column:

I would see the "display_name" in it:

The last row was added by me.

So, you can remove the "Naam" column, configure the "User ID" column in the same way and rename it to "Naam" and it will work correctly.

I reverted all changes, so you can do it yourself. Please let me know if you have any further questions.