DNS routing problem

[Bucking_Horn]

Your screenshot just demonstrates what has been explained already:

@Bucking_Horn

Your observation would suggest that you've configured your router to use Pi-hole as its only upstream

If you want clients to talk to Pi-hole directly, you'd have to configure your router to...

@Bucking_Horn

(...) tell its clients to use Pi-hole for DNS instead instead of the router itself (commonly, that is a LAN/DHCP kind of option).

You'd have to consult your router's documentation for details on its DNS configuration options.