I have a weird issue with two ddns services.

I have and old one, and i just registered a new one.

Both of them has a different IP address. I wrote the IP address in the new one.
Both are installed in two different servers
Servers are connected to two different internet access routers.

After install the new ddns domain and few minutes later, users of the old server told me that they were unable to join the old server.

I logged in dynu control panel to review my ddns services and i saw the both of them with same IP address.

Why is this happening?. Please help.

I want to apologize, my english is not good.

Thanks in advance.

Do they have no groups assigned to them?