Font on Mac build do not render properly

This project has been mainly developed on windows and works just fine.
I just recently opened it on my mac and made a build.

The font is unreadable, even though it's Arial Regular, which definitely exists.
While playing in the editor it's fine, it's only when i build it that it gets screwed up.

With all my Google searches so far this doesn't seem to be a common issue?
Im at a loss as to what it could be, do you have any ideas?

Thanks,
Dek

 

Makes sense thx.