I took another look and it looks like our plugin is loading font awesome v4, and your theme storefront is loading font awesome v5.
You should be able to force load font awesome v5 in our plugin through the following filter:
wpcw_social_icons_fontawesome_5
Adding the following to your themes functions.php file (ideally a child theme, so these changes are not removed the next time storefront is updated) should fix the problem.
function contact_widgets_font_awesome() {
add_filter( 'wpcw_social_icons_fontawesome_5', '__return_true' );
}
add_action( 'after_setup_theme', 'contact_widgets_font_awesome' );
A simpler approach would be to manually set the font family attribute on the icons in the contact widget widget.
Adding the following to your themes ‘Additional CSS’ inside of the customizer should also resolve the problem. You can get there from the dashboard by going to ‘Appearance > Customizer > Additional CSS‘ and pasting the following code in there:
.wpcw-widget-social .fa {
font-family: "FontAwesome";
}
Best,
Evan