Sorry, yeah I misread the debug log.
Looks like your IPV6 address has changed since you first installed pi-hole.. the one in /etc/pihole/setupVars.conf
is different to the actual IPV6.
If Pi-hole is handing out the one in setupVars.conf
to your clients, then they're going to have a bad time resolving domains...
Please see this thread for some information about that: