Somehow automatic DNS on MacOS elude Adguard (and DNS rewrites)

[cellulosa]

I set the DNS on my router to resolve to my working machine (MacOS Catalina) , which is where I am running Adguard Home (v0.107.29).

I noticed that if I leave the DNS servers to auto-populate (in System settings > Network > DNS), the right ones are shown - that is, the machine's own IP (see image).
However, when I go on the Adguard log page, I rarely see that IP. The DNS rewrites also do not work.

However... If I manuallt type my ip as DNS (the exact same ones), then everything starts to work: I can see my IP on the logs and the DNS rewrites do work.

What the heck?! The IPs are the same!