How about other icons? Did you add a media server or a cdn to your site, check this http://www.sunnytoo.com/questions-answers#icons-disappeared-after-using-cdn-or-media-servers
Another possible reason is that one of your 3rd party modules included the Owl carousel plugin to your site again, which caused an conflict.
If you can not figure it out, you can turn off CCC for a while and send me your site url, I will check and let you now what’s wrong.
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