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I appreciate your response. Since you're still having issue regarding the changes that you've made on your notebook, I recommend that you check if you can see a Misplaced Section option in OneNote 2016. Refer to this link on how to resolve misplaced sections. You may also refer to this article when you're using OneNote for Windows 10.
Also, I suggest that you create a new user profile to address the error codes you're getting in OneNote 2016. Here's a support link on how to create a new user profile, then open OneNote 2016 on the new user profile, see if the issue still occurs.
Let me know the result of the troubleshooting