Forwarder only forwarding some addresses?

Hi, 

Ive got nextdns installed on my unifi UDM Pro, I have the nextdns client to forward requests for "my.domain" to 192.168.1.x. it only seems to be reliably doing that for a subset of the addresses. 

I can see in the logs that it's trying to request things in the local domain but it should just pass the request on.