Home directories for Active Directory users are being created under /Users on OS X.
The Active Directory attribute for 'Home Directory' is set to /home/<username>
By default the home directory values for QAS users will be mapped to /Users on OS X.
Set the map-homedir-to-Users option to false in vas.conf by running the following command:
/opt/quest/bin/vastool configure vas vas_macos map-homedir-to-Users false
See the man page for vas.conf for more details on this option.