Hello,
on one of my sites the icons stopped working, after I recently did some changes (mostly I converted the site to be a multisite). It’s this website: https://usd.wireless-empire.de
You can easily see that the social icons in the footer, for instance, don’t work. I don’t know if this problem is related to the multisite change. I opened the Chrome Developer Console but I still don’t know what could be causing the problem.