Site crashing due to plugin

Hi!

Have been having an issue where the site randomly crashes, and the homepage displays all weird. I reached out to the page developer, who looked at the site errors and found that the issue is coming from the Simply Social Icons plugin. It seems the plugin is for some reason attempting to load assets over insecure URLs, when it should be using the https URLs that were set in my dashboard. I’m not sure why it’s switching to insecure, but it’s obviously making the site unusable, so any help in fixing this issue is much appreciated. Thanks.

The page I need help with: [log in to see the link]