Welcom Nginx page while opening on JIO network

The difference is due to IPv4 (desktop, mobile) vs. IPv6 (your 4G network).

Try comparing the difference between

curl -4 -v http://cakehouse.online

^^^ Gets your "cake" website

vs.

curl -6 -v http://cakehouse.online

^^^ Gets the nginx welcome page

Assuming that 2400:8904::f03c:91ff:fe8c:c95 is, as expected, your Linode's IPv6 address - it must have to do with your nginx configuration.

I'd check the server { } blocks and specifically the listen directives. Unless your server handles a multitude of sites under different server names, you can do a simple "listen on all addresses" like this:

    listen 80 default_server;
    listen [::]:80 default_server;

The first listen is for IPv4, the second is for IPv6.

@kmansoft Hey, Thank you very much..
that solved my problem :)