Hello @emanuelechiari,
Sorry for the trouble you’re experiencing.
This has been reported here: Custom font not being displayed in global parts template with WooCommerce or LearnDash activated - #5 by StrangeTech
While at first I thought it was an isolated case, we have had a few reports about similar issues.
We will be releasing a small update to fix the bugs that have been reported lately.
Thanks for your patience and my apologies once again.
Cheers,