Opennic Bind Server ubuntu 20.04

I just setup a bind server on ubuntu 20.04 setup to use opennic, but we also have a normal DNS server (i belive it runs windows) which has all the records for the local network, so all our internal servers and devices.

But when i setup bind as a slave and the Opennic server as the master, and the other local DNS server as a forwarder, either i only get the opennic results or results from the other local DNS server.

I hope someone can help 🙂