OPNsense Unbound and DoT --> nextDNS (leaking?)

Hi I am currently using OPNsense unbound standard setup, together with DNS over TLS with Nextdns. Services/DHCP4/LAN).

 The Problem is, that it seams requests are leaking to other DNS Services like google or cloudflare. At least I can see them by using dnscheck.tools 

I have no Idea how this is even possible, I have for sure not setup settings for google or cloudflare  - not on my clients and not in the firewall-appliance.

Can someone point me into a direction so that I can fix that. I want to ensure that all of the clients only use DoT pointing to nextDNS. 

Thanks for your help in advance!


This is my setup. The system is rebooted and all clients getting their DNS from  OPNsense IP (System/Settings/General/DNS-Servers &




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