In this instance, Word is the end result and, as all the conversion is taking place on the pdf side, the error has to lie there. As such, I’d raise a support ticket with whoever’s software it is and see if t can help out. All you can do in Word is run a spell-check, unfortunately, and hope it picks up the errors.
I'm not talking about a software or a piece of hardware here. The problem does lie inside Word itself, with all software. In which case, all you can do is run a software update. Just be prepared to be on hold while it does the whole process again. Word is a free software product, so updating has the possibility of bringing your copy of Word to a state where it can no longer convert PDF files to Word. And then what do we do when our word processing software is unable to convert PDF files to Word or, worse, it won't help at all! This happens to me, at least once a year, after upgrading to the new and shiny version of Excel. When it goes wrong with PDF files. So let's talk about it What happens when our word processing software is unable to convert PDF files to Word? After some time, an error.