Today I registered/purchased an additional domain name. I alreday have an existing domain name which is being used as the URL for a different IP address.

I have set the new domain via the Manage Dynamic DNS Service page to an alternative IP address. As soon as I browse to the new domain name on the new IP address, I end up at my original IP address on the original server. When I return to the Dynamic DNS management page, I find that the setting has changed to my original IP address. I have repeated changing the setting back, but the same thing keeps happening.

Just to make things clear, the old and new domain names are for use with two different websites being run on two different servers. Why is this happening.