Setting up DHCP server when Windows 2003 server has 2 network cards

I have a Windows 2003 server that I have a small problem with. It is currently a domain controller for the main network which is on 10.15.x.x, but it also has another network card to enable access to my other domain. This network card is on 10.10.x.x. I have set up my DHCP which seems to work fine, but I have noticed that when I look at the DHCP settings in my MMC it shows the details of the DHCP server ie. Server name, domain, ip address but the ip address shows the 10.10.x.x network card when it should show the 10.15.x.x. network card. If I disable the 10.10.x.x. network card it then shows the correct details but as soon as I re-enable the card it goes back to 10.10.x.x. Anybody have any ideas how I get the DHCP server to only be on the 10.15.x.x setting?