CSS not loading with SSL

Thank you for the fantastic plugin.

I’m experiencing difficulty with only two sites out of approximately 20 on a multisite network. When implementing this plugin the css fails to load on the following two sites:

https://seattlecoinshop.com/
https://kirkearlschultz.com/

Any help would be much appreciated.

https://www.ads-software.com/plugins/wordpress-https/