I just visited the page and the icons show fine for me. Here’s a screenshot:
https://pasteboard.co/IeXNVo4.jpg
It does appear you are using a plugin that removes query strings from CSS assets. So, I suspect, your local browser on your PC is using an older version of the CSS file because it does not “know” a new version should be downloaded.
You’ll either have to enable query strings for CSS assets so the browser will download the updated version, OR, clear you browser cache.
Hope this helps!
ps. This is not a bug or limitation in Connections. Without the CSS query string, any time a plugin developer of any plugin changes/updates CSS and the browser does not know to download the new version, you will run into this issue.