There are 2 different warnings:
This one:
This is probably not the site you are looking for!
You attempted to reach https://terb.cc, but instead you actually reached a server identifying itself as
www.terb.cc. This may be caused by a misconfiguration on the server or by something more serious. An attacker on your network could be trying to get you to visit a fake (and potentially harmful) version of https://terb.cc.
You should not proceed, especially if you have never seen this warning before for this site.
Is because you use the .ca instead of the .cc
After you use the .cc you may still see a warning in the address bar of your browser:
It is simply telling you that not all the content on the page is Secure. The reason for this, is while all the content on the Terb.cc server is secured with SSL (the https in your browser) some of the banners and other images are pulled from other locations and not physically on the same server as Terb.