What is the complete command that you are running, from what device, and what is the complete reply?
Edit - a note from review of your debug log - your DHCP server (the router) is passing out Google DNS instead of Pi-hole.
*** [ DIAGNOSING ]: Discovering active DHCP servers (takes 10 seconds)
Scanning all your interfaces for DHCP servers
Timeout: 10 seconds
* Received 548 bytes from eth0:192.168.2.1
Offered IP address: 192.168.2.186
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: 192.168.2.1
lease-time: Infinite
netmask: 255.255.255.0
router: 192.168.2.1
dns-server: 8.8.8.8
dns-server: 8.8.4.4
--- end of options ---
* Received 548 bytes from eth0:192.168.2.1
DHCPOFFER hardware address did not match our own - ignoring packet (not for us)
DHCPREQUEST chaddr: dc:a6:32:a1:54:3b (our MAC address)
DHCPOFFER chaddr: dc:a6:32:a1:54:3c (response MAC address)
* Received 548 bytes from wlan0:192.168.2.1
DHCPOFFER hardware address did not match our own - ignoring packet (not for us)
DHCPREQUEST chaddr: dc:a6:32:a1:54:3c (our MAC address)
DHCPOFFER chaddr: dc:a6:32:a1:54:3b (response MAC address)
* Received 548 bytes from wlan0:192.168.2.1
Offered IP address: 192.168.2.176
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: 192.168.2.1
lease-time: 86400 ( 1d )
netmask: 255.255.255.0
router: 192.168.2.1
dns-server: 8.8.8.8
dns-server: 8.8.4.4
--- end of options ---
DHCP packets received on interface lo: 0
DHCP packets received on interface eth0: 1
DHCP packets received on interface wlan0: 1