The site loads OK for me, but has some mixed content. If you still get an error, you may be connecting directly to your server bypassing Cloudflare due to a cached value which should clear. —> Deprecated - Verifying propagation and caching issues when troubleshooting
As for the mixed content:
Mixed content errors mean that your website is being loaded over HTTPS but some of the resources are being loaded over HTTP. To fix this you will need to edit your source code and change all resources to load over a relative path, or directly over HTTPS.
For example, if you load your images with a full URL:
<img src="http://example.com/image.jpg" />
You would want to change this to:
<img src="//example.com/image.jpg" />
By removing the http:, the browser will use whichever protocol the visitor is already using. An alternative option would be to enable the Automatic HTTPS Rewrites feature that can potentially fix these errors for you automatically. Do be aware that resources loaded by JavaScript or CSS will not be automatically rewritten and mixed content warnings will still appear.
See this Community Tip for further details