Couldn't able to Block Ads with Primary and Secondary DNS

I performed a fresh installation of Pi-hole and Unbound DNS using DietPi. I have configured my router to use Pi-hole as the primary DNS, and when I set Cloudflare's DNS ( as the secondary DNS, I'm not able to block ads. However, when I remove the secondary DNS, Pi-hole is able to block ads successfully.

The issue I am facing:
Details about my system:
DietPi running on NanoPi R6S
What I have changed since installing Pi-hole:
Fresh installation

Thank you

Have a look at below FAQ:

That bit about "Pi-hole and something else" could also apply for your router and is most likely what your experiencing.

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