Pihole does not report the actual traffic

You setup your network to distribute your router as DNS server via DHCP. This is a valid setup. However, did you set Pi-hole to be the only upstream DNS server in the router?

*** [ DIAGNOSING ]: Networking
[✓] IPv4 address(es) bound to the eth0 interface:
    192.168.178.49/24
   * Received 548 bytes from eth0:192.168.178.1
     Offered IP address: 192.168.178.71
     Server IP address: 192.168.178.1
     Relay-agent IP address: N/A
     BOOTP server: (empty)
     BOOTP file: (empty)
     DHCP options:
      Message type: DHCPOFFER (2)
      server-identifier: 192.168.178.1
      lease-time: 864000 ( 10d )
      renewal-time: 432000 ( 5d )
      rebinding-time: 756000 ( 8d 18h )
      netmask: 255.255.255.0
      router: 192.168.178.1
      dns-server: 192.168.178.1
      domain-name: "fritz.box"
      broadcast: 192.168.178.255
      ntp-server: 192.168.178.1
      Port Control Protocol (PCP) server: 192.168.178.1

See here: Fritz!Box (EN) - Pi-hole documentation

P.S. I see you use IPv6 in your local network. But your Pi-hole got an GUA address which is subject to change (e.g. different prefix from ISP). You should assign a ULA to all devices in addition.

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