Better create you own thread as your issue seems different.
Chances are you have another DNS daemon running on ports 53 TCP/UDP, not pihole-FTL:
pi@noads:~ $ sudo netstat -nltup | grep 'Proto\|:53 \|:67 \|:80 \|:471'
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.0.1:4711 0.0.0.0:* LISTEN 20855/pihole-FTL
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 8101/lighttpd
tcp 0 0 0.0.0.0:53 0.0.0.0:* LISTEN 20855/pihole-FTL
tcp6 0 0 ::1:4711 :::* LISTEN 20855/pihole-FTL
tcp6 0 0 :::80 :::* LISTEN 8101/lighttpd
tcp6 0 0 :::53 :::* LISTEN 20855/pihole-FTL
udp 0 0 0.0.0.0:53 0.0.0.0:* 20855/pihole-FTL
udp 0 0 0.0.0.0:67 0.0.0.0:* 20855/pihole-FTL
udp6 0 0 :::53 :::* 20855/pihole-FTL