You have a few problems that need to be fixed.
Go to the SSL/TLS tab of the dashboard, and select the Edge Certificates panel.
Enable “Always Use HTTPS“ and “Automatic HTTPS Rewrites”. You should also set the Minimum TLS version to 1.2.
This should deal with most issues, but you have some mixed content that needs to be resolved, and that the automatic rewrites may not fix automatically.
https://www.whynopadlock.com/results/0103ca63-aff6-4076-945c-4416ec86a3be
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