I have a custom post type that I want to change the entry-title pseudo class ::before with a dumbbell (content: "\f44b";) instead of the default blog icon (content: "\f15c";)
On page load it will show the Font Awesome 5 dumbbell icon then flashes to a square.
on page load:

then this shows:

I think it might be triggered by a JS on the page? Why would this happen…can you take a look?
Site is in development: I will post link in a secure note.