Domain redirecting to UserDir

At first everything works fine but now, whenever I add a new domain (sample.com) the doamin name always opens the test page meanwhile the useraccount UserDir opens the website I added through the userpanel inside the /home/USERNAME/public_html.

What is causing this problem? Is this a bug? Thanks.

Ok I have solved t he problem. Changing webservers solved the problem, previously I was using NGIX, VARNISH & APACHE, now I changed it to APACHE only then it fixed itself. Is this a bug of some sort? Thanks.