Icons not loading

I love this plug-in, and have used on other sites as well. However, on my current one (ballsbridgecounselling.ie) the icons in the side bar are all the sudden not loading. I’ve tried viewing it on different web browsers, and they still don’t load. Is there something I can do to fix this?

https://ww.wp.xz.cn/plugins/simple-contact-info/