Why duplicate A records with same IP in DNS?

Found quite a number of A records with with same IP in my MS Windows 2003 server. This is my MS AD Windows DC's DNS service. What happens is I got a DHCP server, a Wins server, on top of the dns server. I checked the DHCP console, no duplicates of IPs were given out. I also checked WINs, looks good. Now on DNS, to my surprise, duplicates of A records with same IP. I guess some are the old records (so called stale) not purged, is this assumption correct?

What should I do?  

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Are these duplicate records set manually or automatically by DHCP?
You might set DNS to scavenge stale records.
MichaelBalackAuthor Commented:
Hi Strvoli,

These records are set by dhcp server.

how to set to scavenge the stale records? Set how many days?

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MichaelBalackAuthor Commented:
Hi Strivoli,

Sorry for the delay. Let me read through the article...
MichaelBalackAuthor Commented:
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