VPN Dns Leak to Local ISP

Hi
I have an issue and was wondering if there is a fix or its the way it is.

I have a 87u and PIA VPN with merlin firmware.
when I use selective routing to a sepcific IP the DNS and IP shows PIA
when I switch selective routing to Local ISP the DNS of PIA leaks to my Local ISP

If I put prefered DNS like Noroton on Connect to DNS Server automatically area in WAN DNS SETTINGS
and turn off VPN connections I get the right DNS which in my case is Norton DNS and My Local ISP IP is right.
As soon...

VPN Dns Leak to Local ISP