I was doing some research on this and found some old notes (2005). There is likely a difference in how the users are setup. The domain string cannot be located either from the Metadata or from the user themselves and so the default @!(... string is included. Can you verify whether the users that show this '(generatedpassworddomain)' are defined on the host machine?
You could also review the setups in SAS Management Console User manager. Wonder if the 'Authentication' tab is different for the different users.