Perhaps you have DoH enabled in the browser.
Or your system is not using /etc/resolv.conf for primary resolvers.
If it was Linux, you should check NSS configuration.
To signal that their local DNS resolver implements special features that make the network unsuitable for DoH, network administrators may configure their networks to modify DNS requests for the following special-purpose domain called a canary domain: use-application-dns.net.
There is other software than Firefox that uses DoH? How can I block them all?