With this V2, it seems to work fine, but I changed nothing.
I just re-saved the first .ttf with an other font editor : imported and saved, nothing more.
https://www.dropbox.com/s/kh2fyqgcqvws7wh/Custom-font-V2.ttf?dl=1
But I don’t find any difference with the first version. Do you have any idea ?
The first one was made with paintfont.com
and I re-saved the .ttf with Birdfont (birdfont.org) to have the V2.