Someone has previously messed up permissions in a SharePoint site created from Teams. Despite the fact that the Owners group is there in the SP permissions and works, I am unable to add it in Site Collection Admins as it is normally for sites that are created from Teams. Is this normal behavior?
The permissions seems disconnected as in the Team/Group permission I see only one person while in the Site there are many people.
Could it be that this was a standalone classic site and later it was attached to an existing group/team? In this case how you 'connect' the members of the team with the members of the site?