Show social icon not working

I have the box checked to show social icons, but it will only show the text for the social links. For example, it says Facebook but doesnt show the icon.
When I check and uncheck that box, the page that is being edited moves slightly, but I can’t tell what its doing. But its not showing the icons. I was thinking maybe in the same color as the background but if I drag he mouse around it still doesnt seem to find something