Hello Nicole,
Thanks for writing in!
Your icons did not display because you forgot to update Cornerstone. You are still using the old version which is 4.0.4. Please make sure that everything is up to date. Our latest versions are:
- X theme 7.1.2
- Cornerstone 4.1.2
- WP 5.3.2
This latest release contains fixes for several issues so be sure to check out the changelog (http://theme.co/changelog/).
After doing the updates, always remember to clear all caches (if you are using WP Rocket, WP SuperCache or W3 Total Cache) when updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Please let us know how it goes.