Pi-hole blocking internet access

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Unfortunately Vodafone documentation is poor on this bar a very basic manual.

I decided to try test this and see if I could figure out which it is. I could be wrong but from tests below it could be that they are upstream DNS.

So I disabled DHCP on the ISP router and enabled it on Pi-hole. Set ISP router to distribute Pi-hole as DNS. Internet traffic returned, however it was intermittent, some sites worked some didn't. Ran the following tests.

C:>nslookup flurry.com
Server: raspberrypi.lan
Address: 192.168.1.24

Name: flurry.com
Addresses: ::
0.0.0.0

C:>nslookup pi.hole 192.168.1.24
Server: raspberrypi.lan
Address: 192.168.1.24

Name: pi.hole
Address: 192.168.1.24

C:>nslookup flurry.com 192.168.1.24
Server: raspberrypi.lan
Address: 192.168.1.24

DNS request timed out.
timeout was 2 seconds.
Name: flurry.com
Address: 0.0.0.0

C:>nslookup flurry.com 8.8.8.8
Server: dns.google
Address: 8.8.8.8

DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
Non-authoritative answer:
DNS request timed out.
timeout was 2 seconds.
Name: flurry.com
Addresses: 74.6.136.150
98.136.103.23
212.82.100.150

So out of curiosity I set the ISP router DNS to cloudflare IPs (primary & secondary) and ran the tests again. Internet traffic returned to normal with no issues. I blacklisted facebook on Pi-hole to see if it would be blocked or not. It was blocked.

C:>nslookup flurry.com
Server: raspberrypi.lan
Address: 192.168.1.24

Name: flurry.com
Addresses: ::
0.0.0.0

C:>nslookup pi.hole 192.168.1.24
Server: raspberrypi.lan
Address: 192.168.1.24

Name: pi.hole
Address: 192.168.1.24

C:>nslookup flurry.com 192.168.1.24
Server: raspberrypi.lan
Address: 192.168.1.24

Name: flurry.com
Addresses: ::
0.0.0.0

C:>nslookup flurry.com 8.8.8.8
Server: dns.google
Address: 8.8.8.8

Non-authoritative answer:
Name: flurry.com
Addresses: 74.6.136.150
98.136.103.23
212.82.100.150

Looks like everything is working.

I tried one or two ad block test sites (Test your ad blocker (in a few simple steps) - Ads-blocker.com , Block Adblock — The Test page - Oli Warner) to see if ads are blocked and they are.

Would the above test results indicate that the ISP router DNS settings I can change are in fact upstream?