Thank you for the hint.
I will forward this to the server administrator.
But note that both OJS versions are installed on the same server and use the same “pstotext” (or “pdftotext”) file.
If the tool had problems, they would probably appear in both OJS versions? I think so.
The case described is not the only one. I am transferring articles from our old website to the production version OJS 3 and I have more examples.
Regards
Wojtek
Edit
Could you look into this topic: OJS 3.1.2.4 - problem with rebuildSearchIndex ? I added some information there.