3D FlipBook - Problem with fonts

Hello Sir or Madam, I have problem with fonts in PDF file. I have two PDF files, content is same, but they are in different languages. The first file works fine, fonts shows fine, everything is ok...but in the second file (in other language) fonts in 3D flipbook are shown wrongly. Instead words, for example, "Some & example" changed by something ugly, for example "x#s65u;".

Do you know, where is problem?

In console I have no errors. Flipbook works ok, but some words (especialy titles) in text have problem with font rendering.

This is my first issue with plugin, until now worked fine, without problem. Thanks in advance.