Scrambled sentences in Word doc?

I've been working on revisions for my novel (I'm an author and these edits are for my publisher), and I noticed that MS Word will sometimes scramble my words and sentences. It's not all the time or on every page, but I haven't figured out what triggers it (maybe it's where my editor left "tracked changes" comment balloons, which I later deleted, or maybe it is where I have some apostrophes that Word did not like, or maybe it happens whenever I work on a file using the mobile app for iPhone, or maybe it is just random). In any event, I noticed the problem about a month or so ago, and I didn't know how to recover the document. Fortunately, I had the original document my publisher sent me, so when it came time to do revisions and I came to a wonky part of the text, I just copied the text over from the clean document and used that for my revisions.

Well, now that I am mostly done with revising my document, I've noticed that Word is STILL corrupting/scrambling my sentences. The problem now, though, is that it's doing it to my revised document, so it's hard to track a version of the document that has unscrambled text. I've got a bunch of saved files that should theoretically help me, but I feel like when I open them, the same paragraphs are all getting corrupted. I can go back to the clean doc from my publisher, but then I lose all the revisions I made (which is not an option). How do I clean my document and stop it from getting corrupted again in the future? I can't work like this!!!

-Justin

Office 365 for Mac

Here's an example, by the way, of what I am dealing with:

Clean/original paragraph:

Kenton nodded. ‘It wasn’t too hard. I held it and thought about how thirsty I was.’

‘That’s not so bad, I guess. What’d you fill it with?’

‘Honeywine. Dorstal drank it when he reallised.’

 ‘So maybe you could use a common artifact,’ Annev said, trying to draw the attention back to the mission, ‘which the rod probably is, if Janak used it on Dorstal. So we should concentrate on finding the rod first.’ He wheeled his horse around. ‘C’mon. Let’s find a spot to tie these horses up.’

First time it got corrupted:

Kenton nodded. ‘It wasn’t too hard. I held it and thought about how thirsty I was.’

‘Thatgrunted.thought about how thirsty I was.ne could’

‘.oneywine. Dorstal drank it when he reallised.’

‘So maybe you could use a common artifact,’ Annev said, trying to draw the attention back to the mission, ‘which the rod probably is, if Janak used it on Dorstal. So we should concentrate on finding the rod first.’ He wheeled his horse around. ‘Ce wheeled his horse around.  o kill Duvarekt Do’

My revised (clean) paragraph:

(Can't find a clean version, because this crap happened...)

Most recent wonky/corrupted paragraph:

Kenton nodded. ‘It wasn’t too hard. I just held it and thought about how thirsty I was.’

‘Huh, it and thou‘That’s . . . not so bad. What’d you fill it with??

‘Honeywine,neywinel it with?? abo. ‘Dorstal drank it when he realised.’ The trio laughed at that and Annev felt encouraged by the admission. He wheeled his horse about. ‘C’mon. Let’s find a spot to tie up these horses.’

UPDATE #1:

I did some testing by highlighting the problem fields and saving multiples instances of the document (some with revisions and some without), and it appears that those files are becoming corrupted whenever I use "Save As" to create a new version of the document (a common practice when I sometimes need to go back to a previous version of the document, so I name each document with a new version number). If I just save the document and close it, things seem to be unchanged, but whenever I use "Save As" things go haywire. Thoughts, suggestions, or solutions?

UPDATE #2:

After some further testing, I've come to the conclusion that none of the new text is being corrupted (only the old paragraphs that needed to be revised). It also seems that the scrambled sentences have exactly the same number of characters (and appear in the exact same locations) as the original documet. Consequently, I have a work-around solution to the problem, which is this: manually type an exact duplicate of the text that is getting scrambled (before it gets scrambled) then delete the old/corrupted text so it no longer appears in your document. If you do that, the problem appears to go away (it does not repeat itself with the new text you manually typed, so long as you didn't enter it directly into the corrupted paragraph). If you do that, the new/uncorrupted text can effectively take the place of the corrupted text (thereby preventing future sentences from getting scrambled). It's a bit of a hassle, but it works for now. Also, if you can identify the exact characters that get mixed up when you use "Save As," you can type just those characters into a normal part of your document (the part that is not corrupted), and then you can copy-paste your clean text over the spaces that keep getting scrambled. Once I've done that for all the corrupted portions of my document, I should theoretically be cured of this problem (yay!). If someone comes up with a better solution, though (or can explain exactly why this is happening), I'd love to hear your thoughts.

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