icons not showing

I also posted this in an old thread, but since the status is solved, you might have missed it.

I use version 2.3 and since a few days the social media icons are missing:

https://screencast.com/t/0JZ8HMdfvLPA

You can see it for yourself on this site:

https://www.websiteacademy.nl

How can I solve this?

Thanks!

Wouter

P.S. I really like your plugin, and when there is a solution for my problem I will definitely buy the pro version.

https://www.ads-software.com/plugins/cresta-social-share-counter/