Duplicate client entries ion Mac OS X 10.5.7 DHCP

I have DHCP server running on Mac OS X 10.5.7 which has duplicate entries for the same client within DHCP. The duplicate client entry has the same ethernet address, same IP but the lease time is different.
I have stopped the service, cleared the DHCP lease and restarted the server and service which seems to clear this for a while but it eventually returns.
Some clients fails to obtain an address from DHCP until you turn off and on the IP setting within the built-in ethernet. When they do two entries appear in DHCP.
I have checked other 10.5 servers that I have installed and the do not experience the same issue this one has.
The lease time for the IP is 2 weeks. Server is connected to Gig network port.
Any help is appreciated..

Found out that the onsite computer support person had enable the second NIC and it had the same IP as the server. Disbaling the second NIC corrected the issue.

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