When DHCP is enabled on the Pi-Hole (and disabled on the router), internet pages do not load or load slow, also the router is not accessible by it's IP, when I disable the DHCP on the Pi-Hole and enable it back on the router, everything goes back to normal. I also installed unbound and pivpn (wireguard), but the problem is only happening when the DHCP is enabled on the Pi-Hole.
Raspberry Pi OS
Raspberry Pi 4