You manage WHM/cPanel server and it is hosting a website, but currently domain is pointed to different server so this web server is iddle.
But then you point domain to this WHM/cPanel server, but it shows a different domain's website. This different website is hosted on same server so we are on correct server.

The cause of this can be that your website is redirecting to a HTTPS and you do NOT have SSL installed so it fails and shows first SSL enabled website that is hosted on the server. The first site is one that has the first SSL (:443) virtualhost entry in /etc/httpd/conf/httpd.conf