For me its quite the opposite.
Your Fontawesome icons are showing on the homepage, and also showing on all other pages, the only pages they don’t show for me is when the URL changes to MetaRiki.
Example:
FA icons showing: https://www.mistermarilyn.com/?p=131
FA icons not showing: https://www.metariki.com/marilyn/?p=131
The Fontawesome script on Metariki is being loaded via the Mistermarilyn URL, which throws out lots of errors in the console:
Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://www.mistermarilyn.com/wp-content/themes/onepress/assets/fonts/fontawesome-webfont.ttf?v=4.4.0. (Reason: CORS header 'Access-Control-Allow-Origin' missing). (unknown)
downloadable font: download failed (font-family: "FontAwesome" style:normal weight:normal stretch:normal src index:3): bad URI or cross-site access not allowed source: https://www.mistermarilyn.com/wp-content/themes/onepress/assets/fonts/fontawesome-webfont.ttf?v=4.4.0
