Font Awesome - icons render correctly in axshare, but NOT in

Hi there,

I’m sharing the same prototype on axshare AND on with a developer.

On the axshare version she can see the font awesome icons with no problem, BUT when she looks at it on, the icons are missing, and just rendered as empty squares.

Is there a reason why these two should be different? How can I fix this? Thanks in advance for any suggestions.