Can you restore above boxes and run below one for rdwebdesign to check for any RDNSS (Recursive DNS Server)?
sudo pihole-FTL dhcp-discover | pihole tricorder
Post the resulting token URL pls?
EDIT: Oh you can check too by running only below:
sudo pihole-FTL dhcp-discover
Dont post full output for above one here for privacy!
Look for any lines that start with "Recursive DNS Server"?
Eg: