My Deco XE5300 is having a DNS Leak when using the VPN Client. Tried the built in VPN Client two ways: Using NordVPN token method with config downloaded from NordVPN website.

Second method is the custom OpenVPN option using the ProtonVPN username/password within account settings and downloading a config.

Both methods sucessfully connect and devices are connected to the internet. After running tests on dnsleaktest and ipleak websites, they both show that dns leak has occured and using 3rd party dns resolver (Cloudflare) instead of staying within the VPN DNS only.

I've followed the steps given on Deco site and have been unable to fix this issue. 

Please fix this security flaw.