I wanna report a bug that seems to be known but still existent as I tested it on FM 14 and 16.
Tested on Windows 10 last update on two different computers.
When I select a google font, it switches to another font. Always the same font, but different per computer.
To replicate it, just download some font on Google Font (I tested a lot, but among others : Roboto, Arvo, Nunito Sans) and try to use it.
I don't know any workaround. I found this : Why does this Google font 'Raleway' work on Mac and FMGO but not Windows? and jgalt seems to have found something but I don't know how to replicate what he did.