Hi,
we have checked your pdf with the demo project and it works properly.
Your pdf is using a "Calibri" font.
Make sure to have the correct font mapping in the Global.Init() method, our library map Calibri as Arimo as you can see in that method.
Check if you load Arimo in your project and you must have it in your assets (ViewLib\src\main\res\raw)
I suggest you to compare your Global.Init() method with the demo one.