Opening the browser console when accessing your site shows these errors:
Failed to load resource: net::ERR_CERT_AUTHORITY_INVALID
Access to font at 'https://XXX.XXX.XXX.XXX/wp-content/plugins/alidswoo/src/css/icons/fontawesome/fonts/fontawesome-webfont.ttf' from origin 'http://XXX.XXX.XXX.XXX' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
As you can see, it is trying to obtain the icon via https but you don't have a valid certificate. Probably, it is due to a plugin/theme configuration.
To enable CORS, please take a look at our documentation:
Also, accessing vernec.com, which points to a different IP, works properly (this sites redirects to HTTPS).