The mixed content warning occurs when your site is loading a resource or executing a script file loaded from HTTP in a page served via HTTPS.
Your site is trying to load:
<img src = “http://mysiteimage.com/images/logo.png”
To fix the issue, simply use relative paths from the root by changing it to:
<img src= “/images/logo.png”>
Or change it to
https, but it’s easier to omit the protocol and let the browser resolve the URI from the request.