Applicable for Elementor Powered themes only.
Point to note: Depending on your purchased theme, screenshots can vary.
If you see some icons are missing from footer/content area/footer then there is very easy fix available. If you have updated Elementor recently then you may see some of the icons are not loading properly. Please follow below steps to fix this.
Go to Elementor -> Settings -> Advanced and enable Fontawesome 4 icons -> Save changes.