There are characters, witch are not displayed in original documents

Hi,
after some tests of our documents in HTML format on your online converter (Convert Documents Online (aspose.app)) we found characters, witch are not displayed in original documents (in the attached figures they are marked with number 3).
Could you comment on these problems and is it possible to fix them in the near future?

We have attached the original document in HTML and PDF formats, screenshots of the display of the original files in Chrome and Acrobat Reader applications, and screenshots of converting result to MS Word.
samples.zip (261.9 KB)

@AnatolySRS

We are already investigating this issue here.