The mixed content fixer could not be detected due to a cURL error: cURL error 60: Peer’s Certificate issuer is not recognized. . cURL errors are often caused by an outdated version of PHP or cURL and don’t affect the front-end of your site. Contact your hosting provider for a fix
What browser are you using? Where do you get it?
The mixed content fixer doesn’t work with our free SSL certificates, sadly. I don’t have a fix I can offer you, except for using Cloudflare or upgrading to premium hosting.