When I saw your screenshot I thought that your SFDC team had just renamed the Contact object as Individual - should definitely check. But I made this assumption because quite honestly if it was Individual the objects were associated to, you would not see the associated custom objects in the sync.
Nonetheless, because none of us can get into your system to troubleshoot, I definitely think Support is the right call for now.
Just to follow up on this - having got to the bottom of it it WAS the obvious answer first - a sync backlog. What I hadn't realised was that standard objects sync as a priority over custom objects, and because our sync settings are set to only sync once per hour, it actually took us until yesterday to sync over all the objects. Hope that helps if anyone else is in the same boat!