If you recently made changes to the domain it is possible that DNS caches have not expired. For instance, if I
curl your domain I receive this response:
<title>Welcome to nginx!</title>
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
Commercial support is available at
<p><em>Thank you for using nginx.</em></p>
The old DNS was not cached for my ISP so I am able to resolve the domain and am connecting to your droplet (presumably).
Sometimes DNS caches and propagation can take up to 48H although its usually no more than 4-8 hours these days.
Hope this helps and good luck - reach back out if the problem has not cleared up soon.