nginx使用正确的根指令响应公共IP地址，但使用域名使用apache2默认根响应

My Ubuntu 18.04 server is running nginx and apache2 using this guide

I have my site-specific nginx config file /etc/nginx/conf.d/my_domain.conf. Inside the file, I have:

server {
 root /srv/my_site_root/;
 server_name x.x.x.x my_domain.com;
}

In my browser when I access x.x.x.x, the site is served up correctly. When I access using my_domain the server responds using apache's default /var/www