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Ads should be blocked
Ads are only blocked for a short while, before they are allowed through
Pihole was working for many months, then late last year I noticed ads started appearing. I would run pihole -g and this would fix it for a few hours, but then ads would start appearing again.
I rebuilt my server, and I’m getting similar behavior. Though ads only seemed to be blocked for a few minutes before they start appearing again. I’ve used several different “Adblock test” sites, and they all confirm that ads are being blocked for a short amount of time before they report ads are going through. I’m clearing my cache, not using any other adblockers, not using any custom DNS files on my clients.