Menu drop down icons not working

I’m using the current version of WordPress and the Highend theme and my icons on my home page do not work. Instead, they are replaced by little boxes. This is drop-down menu icons, social icons and return to top icon. This only occurs on the home page though. Once I go to a new page the icons are working again.

I have tried deactivating my plugins one by one and that didn’t help. I also search for previous topics relating to this but I can’t find a solution.

My site is spitfirespice.com