Side note: you're using nginx which is a not-supported web server
[80] is in use by nginx (https://docs.pi-hole.net/main/prerequisites/#ports)
*:8080 nginx (IPv4)
*:81 nginx (IPv4)
*:443 nginx (IPv4)
[80] is in use by nginx (https://docs.pi-hole.net/main/prerequisites/#ports)
*:8080 nginx (IPv4)
*:81 nginx (IPv4)
*:443 nginx (IPv4)
[80] is in use by nginx (https://docs.pi-hole.net/main/prerequisites/#ports)
*:8080 nginx (IPv4)
*:81 nginx (IPv4)
*:443 nginx (IPv4)
[80] is in use by nginx (https://docs.pi-hole.net/main/prerequisites/#ports)
*:8080 nginx (IPv4)
*:81 nginx (IPv4)
*:443 nginx (IPv4)
[80] is in use by nginx (https://docs.pi-hole.net/main/prerequisites/#ports)
Your router advertises itself and Pi-hole via DHCP as DNS server. You should configure to only advertise your Pi-hole, otherwise your clients will bypass Pi-hole.
*** [ DIAGNOSING ]: Discovering active DHCP servers (takes 10 seconds)
Scanning all your interfaces for DHCP servers
Timeout: 10 seconds
* Received 300 bytes from eth0:192.168.1.1
Offered IP address: 192.168.1.10
Server IP address: 192.168.1.1
Relay-agent IP address: N/A
BOOTP server: (empty)
BOOTP file: (empty)
DHCP options:
Message type: DHCPOFFER (2)
server-identifier: 192.168.1.1
lease-time: Infinite
netmask: 255.255.255.0
broadcast: 192.168.1.255
dns-server: 192.168.1.10
dns-server: 192.168.1.1
router: 192.168.1.1
--- end of options ---