This could indicate a corrupt input file. Are you able to open the Word document in a viewer like Microsoft Office or LibreOffice? I’ll need some additional details to reproduce this in our environment and investigate. Can you send me the following information so I can do so?
Input file(s)
Generated output file(s) - If any
Code and settings used to generate (2) from (1)
Screenshots showing the output, and clearly indicating what you expected to get instead, and also clearly indicating the application/browser being used to view.