Use these tools to help determine why the ads are not being blocked. Common issues - the browser or client is not using Pi-hole for DNS, you have a VPN active, etc.
How do I determine what domain an ad is coming from?'
And, from a client that you believe should be connected to the Pi-Hole for DNS (ideally the one on which you see ads), from the command prompt or terminal on that client (and not via ssh or Putty to the Pi), what is the output of
nslookup pi.hole
nslookup flurry.com 192.168.50.169