In the user management, the list of authors, co-authors and the combination is shown:
authors: the users with the role "author", regardless of the ownership of a course
co-authors: the users that are owners of a course but don't have the role "author"
authors and co-authors: users with the role author or owner of a course
The problem is that when the code was refactored to make co-authors not automatically also get the author permission, the listing in the user management was not adjusted.
The list does not reflect the actual permissions on the system