Social Icons Header Right Sidebar

I wish to display my social icons in my header right sidebar. I have registered my social media URLs in the Social Links menu on the Customiser. I have the widget CT Social Links activated. However, the social link icons (FB, Twitter, Instagram) do not display. Previously, I appeared to have no problem with this. The icons appeared automatically. Something seems to have changed. See the website: http://christianbrothervocation.org/ Can you help me with this please. Dpma;