Weird Dashboard behavior. It's fixed, but wish I understand what happened

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Pi-hole should be your network's only DNS server.
When offering an alternate DNS server to your clients, that DNS server will be used at a client's discretion. It would depend on a client what triggers that use and how often that happens.

This is more likely to happen in your network since your Pi-hole's IPv6 address seems to be incorrect:

*** [ DIAGNOSING ]: Networking
[✓] IPv6 address(es) bound to the eth0 interface:
   2804:<redacted>:b3e6 does not match the IP found in /etc/pihole/setupVars.conf 
   fe80::<redacted>:4215 does not match the IP found in /etc/pihole/setupVars.conf (https://discourse.pi-hole.net/t/use-ipv6-ula-addresses-for-pi-hole/2127)

*** [ DIAGNOSING ]: Name resolution (IPv6) using a random blocked domain and a known ad-serving domain
[✓] ads.centraliprom.com is :: via localhost (::1)
[✗] Failed to resolve ads.centraliprom.com via Pi-hole (2804:<redacted>:bbb3)

I'd recommend removing that second DNS server.
Also, see if you can Use IPv6 ULA addresses for Pi-hole, or use your Pi-hole's link-local address (fe80).

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