Pi-hole doesn't log since Huawei Modem is in use

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Your DHCP server is providing two IP's for DNS, neither of which is your Pi-hole.

*** [ DIAGNOSING ]: Discovering active DHCP servers (takes 10 seconds)
   Scanning all your interfaces for DHCP servers
   Timeout: 10 seconds
   
   * Received 424 bytes from eth0:192.168.8.1
     Offered IP address: 192.168.8.115
     Server IP address: N/A
     Relay-agent IP address: N/A
     BOOTP server: (empty)
     BOOTP file: (empty)
     DHCP options:
      Message type: DHCPOFFER (2)
      server-identifier: 192.168.8.1
      lease-time: 86400 ( 1d )
      renewal-time: 43200 ( 12h )
      rebinding-time: 75600 ( 21h )
      netmask: 255.255.255.0
      router: 192.168.8.1
      dns-server: 192.168.8.115
      dns-server: 1.1.1.1
         --- end of options ---
    
   DHCP packets received on interface lo: 0
   DHCP packets received on interface eth0: 1

    PIHOLE_INTERFACE=eth0
    IPV4_ADDRESS=192.168.1.65/24

Pi-hole should be the ONLY DNS offered by the router. Fix this in the router and renew the DHCP lease on all clients.

If the router insists on multiple DNS entries, try entering the Pi-hole IP twice, or use an unused IP from your LAN range in the second position. Don't use Cloudflare or something else, or some of your DNS traffic will bypass Pi-hole.