Question : Set number of Clients in WSUS ?

Our WSUS server views 22 computers in the Update Services Console; we have 45 machines pointed to the server for updates using group policy. When I log into a machine that is not reporting, I run   wuauclt /resetauthorization /detectnow and it appears in the WSUS console,   BUT one that was previously there disappears, leaving the number at 22.  I cannot find anything about this online through my searches.  Any help would be greatly appreciated.

Answer : Set number of Clients in WSUS ?

Do you use any cloning software when setting up your machines? I can only think of changing the SID on one of the machines not in the group for a test.