Dns is not updating records
This happens even though DHCP registered the record.
This is because DHCP doesn’t own the record, the client does, even though DHCP registered it.
With the default settings, a duplicate A record gets registered by DHCP with the client’s new IP.
This is because the client will not update itself due to the current record in DNS is beyond the lease period.
Also, it will allevaite another issue – If DHCP is on a DC, it will not overwrite the original host record for a machine getting a new lease with an IP previoulsy belonging to another host. Quoted from the following link: “Name squatting occurs when a non-Windows-based computer registers in Domain Name System (DNS) with a name that is already registered to a computer running a Windows® operating system.