icon font in social share not displaying after installing Hummingbird


I’ve installed Hummingbird, but it breaks the icon font in the social share plugin (just squares there). By turn, I tried to reset minification or other parts of Hummingbird. When I open the site in a new browser it then shows the font, but when I open the site again, they’re gone again.

I used Enfold as a theme and Access press social share for the plugin.

What could be the problem?