Thanks for the info Mosche!
I really appreciate your answer and I will definitely give it a look.
However, I still don’t get why I can’t get the effects I want only in generatepress 🙂
It’s like if the script gets loaded twice. Once with the standard default loading bar in the center and in the meantime the correct animation gets loaded too…
I tried the same snippet on 4 different child themes without any issue and obtaining exactly the effect I should have
Can someone help me to point out why?