[SBS 2011] Alle computers show twice on the network

I have the following problem:

When I check my network in Windows Explorer at Network all the computers are showed twice. There is not a big problem now, but I think this is not good. Is here anyone who know what the happens and what the solution is for this problem?
Program1981Asked:
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Larry Struckmeyer MVPCommented:
No idea.... can you verify that this persists after a restart?  With the current round of updates, particularly the RDP problem, you should either have a fresh restart or about to do one.
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Program1981Author Commented:
Sorry for the late answer.

After a restart it occurs not at all computers, but only two at this moment. Is there anybody who can help me?
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Program1981Author Commented:
It was a problem with the DNS-server. There were old records in our system.
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Program1981Author Commented:
We find a problem with our DNS-server. The refresh was not ok.
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