When clicking on the Desktop Group name, it shows a specific number of VDIs. However, when clicking on Desktops tab, actual number of VDIs there is less. The 'missing' VDIs are available and can be connected by users.
Defect ID 221777 has been created for the issue.
Workaround: in vWorkspace Management console, <desktop group>, Desktops tab, right-click the columns list on the top, select Column Options and add the Connector Version into the list.