Here is a problem. Only one of these DNS servers is your Pi-hole. Given multiple DNS servers, clients are free to use any of them at any time.
This client did not get those DNS assignments from the DHCP server, so this appears to be something assigned locally on the Windows client:
*** [ DIAGNOSING ]: Discovering active DHCP servers (takes 10 seconds)
Scanning all your interfaces for DHCP servers
Timeout: 10 seconds
* Received 300 bytes from wlan0:192.168.8.2
Offered IP address: 192.168.8.127
Server IP address: 192.168.8.2
Relay-agent IP address: N/A
BOOTP server: (empty)
BOOTP file: (empty)
DHCP options:
Message type: DHCPOFFER (2)
server-identifier: 192.168.8.2
lease-time: 86400 ( 1d )
renewal-time: 43200 ( 12h )
rebinding-time: 75600 ( 21h )
netmask: 255.255.255.0
broadcast: 192.168.8.255
dns-server: 192.168.8.2
domain-name: "lan"
router: 192.168.8.1
--- end of options ---
DHCP packets received on interface lo: 0
DHCP packets received on interface wlan0: 1