Primary DNS addresses V4 and V6 detecting as unconfigured.

When I logged into portal, I noticed the website was saying that I was not using NextDNS even though I haven't touched my network settings in a while.

This device is not using NextDNS.
This device is currently using ”EDGEUNO SAS” as DNS resolver.

Visiting test.nextdns.io seemed a bit random, with sometimes correctly showing it was using my profile and sometimes without it.

{
"status": "unconfigured",
"resolver": "200.25.56.100",
"srcIP": "[redacted IPv6]",
"server": "edgeuno-sao-1"
}

I thought something changed my network settings all sudden but no, Windows and router both has the correct addresses. I attempted to resolve domains with that resolver but none of the three I saw were reachable directly.

Started playing with nslookup and dns addresses assigned to me and noticed some responses were a bit off between primary and secondary addresses of each protocol (V4 and V6). Resolving test.nextdns.io with primary lead me to these addresses:

Name:    test.nextdns.io
Addresses:  2800:1e0:1020:3::5
          200.25.57.69

Attempting with secondary gave me a different set:

Name:    test.nextdns.io
Addresses:  2a00:11c0:f:ffff::5
          37.252.238.25

So, I removed all of the primary addresses and left only secondary of each:

{
"status": "ok",
"protocol": "DOH",
"profile": "[redacted]",
"client": "[redacted V6]",
"srcIP": "[redacted V6]",
"anycast": true,
"server": "anexia-sao-1",
"clientName": "unknown-doh",
"deviceName": "[redacted, devname is correct too]",
"deviceID": "[redacted]"
}

Success! Everything was good.

Is this happening with someone else? Did I have set something wrong?