If you are having an issue where as you add computers to wsus the next one replaces the last one leaving only one of the recently added computers visible in wsus you may have cloned the computers without running sysprep or you ran sysprep and did not reset the sid. To fix this problem without having to reinstall or reimage all of the computers open an elevated command prompt on each of the computers and run the following commands. You can also open notepad and copy all of the commands and then save the file as a .bat or .cmd file choose the all files option. This file could be run as a startup script but will not work as a logon script.
net stop wuauserv
REG DELETE “HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate” /v AccountDomainSid /f
REG DELETE “HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate” /v PingID /f
REG DELETE “HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate” /v SusClientId /f
net start wuauserv
wuauclt /resetauthorization /detectnow