Old DHCP IP showing in ipconfig /all

I recently migrated a 2003 DHCP database to a 2008 r2. The newly configured workstation will pick up the right IP settings including DNS, DHCP server, and gateway but the old workstations will still resolve to the old DHCP server's IP. I run these commands with admin privilege to my test workstation:

ipconfig /release 
net stop dhcp 
net start dhcp 
ipconfig /renew

but the result of the ipconfig /all still points to the old DHCP server IP. Also, I manually deleted one DHCP record for testing, I issue the same commands it picked up an IP but its still showing the old DHCP server IP and it's not showing on my current DHCP server address lease table. Any suggestions.

Also, I added the new dhcp server ip to my switch and router.

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