Hello @joshhhh, thank you for your post 
I believe this topic has been discussed some time ago here: Fonts Activated in FontBase Don't Appear in Figma
For now it looks like the reason is the inner differences between how Figma and other desktop apps operate (text editors, CC apps like Photoshop etc.) and there’s little we can do on our end to rectify this. Although we do keep this issue in mind and are in constant search of solutions that would make FontBase even more convenient for our users
Thank you again,
Yuriy
FontBase Dev Team