Don't use <i but <span
In all your examples, you say users to write <i class="fa... instead of <span class="fa... You recommand to use span instead of i only at once time on https://forkaweso.me/Fork-Awesome/examples/
The result is that mainly all the projects using Forkawesome are keeping your syntax <i class="fa... and in these cases, the icons are displayed differently, a bit smaller and lower than with a span tag.

Could you change <i by <span in all your examples ?