Stale DNS entries in a network table?

The issue I am facing:
There are multiple duplicate DNS records "nextcloud.domain.com" I see in my network table.
Yes, I had nextcloud running on my laptop few months ago. However my CNAME records table doesn't contain that record anymore (See the attachment). Whenever I clear the network table, these duplicate entries appear again. Please, help me understand the source they are coming from


Details about my system:
Pihole + unbound recursive resolver. DHCP on router level. RPi 4.

What I have changed since installing Pi-hole:
I have installed unbound.

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