Stubby keeps connecting to cloudflare, suddenly doesn't work with Google DNS or NordVPN DNS (it was working last night)

Hi, so the issue is exactly what the title says. Last night, trying out editing stubby file in etc/config/ and managed to connect to google dns and nordvpn dns successfully. However, this morning, it suddenly didn't work. Already restarted the router but it keeps connecting to cloudflare instead. Maybe someone can help me with this? Thank you.