DNS server that i set keeps resetting after reboot

[mrdreamers]

I'm trying to use 1.1.1.1 dns server but it keeps resetting after reboot, i even set it on my dlink router and when i check it by going to command prompt and putting in "nslookup" its back to what it was what can i do?
i do use a vpn torguard but even when i don't use it it still resets