Newly set up pihole on a pi3. Everything is up to date and Im running unbound behind it as well. Everything is being blocked except for one domain and it's subdomains - applovin.com. The domain is in several of my blocklists including https://blocklistproject.github.io/Lists/ads.txt and I've even added it into manual blocklists, but it keeps getting resolved.
Web Interface [v5.18.4]
restarted DNS to flush cache, and it's still pulling it back:
raspberrypi:~ $ sudo pihole restartdns
[✓] Restarting DNS server
raspberrypi:~ $ nslookup ms.applovin.com 127.0.0.1
Don't be that harsh to yourself - sometimes, a second pair of eyes comes in handy.
Next time, you know you could consider to create and check the debug log to help you help yourself (in case you missed it, that's stored in /var/log/pihole/pihole_debug.log).
And if my findings helped you in the end, the time was certainly not wasted.