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Duplicate computer name but one of them with SID

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I have seen duplicate computer name in AD.

e.g. One PC was call 456 and the other called 456 cnf:850255521

Why they are two same PC name, I have ask everyone but know one knows why.

Can someone please explain why system will have same name
asked Oct 21, 2014 by ali  

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Best answer
This occurs because two objects with the same name were created on different domain controllers before the change was replicated to the other. Duplicates cannot exist so the first one got renamed.

(Possibly an admin made the computer account manually on one DC and then joined using the other DC?)

Pick the one that is in use and delete the other.
answered Oct 21, 2014 by JamesRyan  
OK I do understand. That mean when I have two user account with same account but one with sid in logon is also having same problem –