Perhaps you or someone else with access to your notebooks deleted notes accidently. Fortunately, OneNote automatically saves notes for a limited time after they have been deleted.
How to recover your deleted notes in OneNote
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Open the notebook where you expected to find the lost notes.
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Choose View > Deleted Notes.
If you find your deleted notes here, you can recover them by moving the pages back to their intended locations:
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Tap and hold, or right-click the name of any page that you want to recover, and then choose Restore To.
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Choose the notebook section where you want to move the page, and then choose Restore.
If you want to move the page to a section in another notebook, select < next to the notebook name, choose the notebook, and then select a section within it.
Repeat these steps for any other pages that you want to move out of Deleted Notes.
For more information, visit Find my lost notes.