Hi
mimime1,
According to your description, you could try to backup and restore Sticky Notes in Windows 10.
https://www.tenforums.com/tutorials/73044-backup-restore-sticky-notes-windows-10-a.html
Please Note: Since the website is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.
If you met the issue after install updates, you could check the Windows Update history to uninstall what update you installed to check.
If the issue still insists, you may need to repair or restore it by running following commands:
Dism /Online /Cleanup-Image /RestoreHealth
Hope it will be helpful to you
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