Microsoft OCR: same server, same settings, different accounts, different results

We have one server, I mean, machine with O.S. and different accounts on it. The robots use the Microsoft OCR activity inside the Read PDF with OCR activity and the issue is that it outputs different results depending on… the account you’re running it from. This is kind of strange because the environment is absolutely the same and the settings are the same as well. Literally everything is the same except for the system account. Does anyone have an idea why?