Ironically enough, this forum displays the same address bar warning as the site I configured the server for.
- There is no mixed content, everything is configured to display with https.
- A rating on ssllabs.
- Using Comodo Dragon browser (customized version of Chrome browser, iirc).
Warning looks like this, just like on this forum:
Other secure websites like imgur, amazon, google, etc don’t have the same warning message. I’m inclined to think this is browser related because this website is showing “Not Secure” in the address bar without any other warning.