Make sure you're using the correct file names for each variation of the font family. You also need a recent version of Mantano (sorry, not sure which exactly).
On mine, I've copied the four files for each font into /sdcard/Mantano/Fonts. For example:
Amasis30.ttf
Amasis30-Bold.ttf
Amasis30-BoldItalic.ttf
Amasis30-Italic.ttf
I'm seeing correct variations in ebooks.
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