When using your phone esp. android, and analysing the certificates on any of the CourseSales.com pages you might notice a message included below.

As mentioned on the Servertastic website “This is a new feature in Chrome surrounding Certificate Transparency. It can affect all certificates issued by any CA. At present it does not have widespread adoption among CA’s as it is not an industry standard.” The Conetix website says in reference to this “This does NOT indicate that there is an issue with the certificate or website. As indicated by the green lock, this is still a valid certificate which has been served correctly by the website. " This issue will eventually be fixed by the Certificate Authority themselves (apparently at present only Google Internet Authority applies this almost-standard).