Obviously that happens and with books too. If I read one review complaining of formatting, spelling, omissions, etc. then I don't download the book. If there aren't any reviews about that then I assume a 50/50 chance of it being badly edited.
What if this, what if that... If you worry about something like that you can always research his letters (for example), download a free sample (in case the Kindle version you want costs something) and check the table of contents. You can also "Look Inside" of the book versions at the table of contents to see how they match up. Or you can just buy the Penguin or Wordsworth Kindle version... It's up to you.
I'm not putting anyone out of a job downloading pre-1923 books for free. And if I download the free version of a contemporary book, published on Amazon by the author, it would usually be that the book was published by the author on Amazon, because they had a hard time getting it published...

