Aura HD Problem with Amasis font and diacritic

I'm reading a book called 1Q84 on my HD, and when using the Amasis font 1 particular letter always shows as very, very small.

For example, in the word Janáček, when using Amasis the c is very tiny. All other fonts show it correctly. Any ideas?

Also, when I set the font on this book to "Document Default", all serifs for letters on the bottom row of text are cut off, and appear in the top row of the next page. Again, only "Document Default" font is affected, all other fonts don't exhibit this problem.