The issue I am facing:
My Dashboard acted weird (see printscreen), although PiHole seemed to keep working just fine.
I tried rebooting my Raspberry when I noticed it and it seemed to fix it, but I really wish I knew what happened and if there's something I could/should do to properly fix it.
Details about my system:
I'm on a Raspberry Pi 4, 4Gb RAM, with Raspberry Pi OS (Buster).
I'm running a cloudflared client, configured following the docs at pi-hole.net
What I have changed since installing Pi-hole:
Installed cloudflared, steamlink and RetroPie on it. All of them days before this problem surfaced.