Why does the Exchange calendar only sync one way?

Question

Android

You have an iOS mobile device that has an Exchange account configured for calendar sync. Calendar events created in Outlook on a computer appear on a mobile device, but those created on a device do not appear on a computer.

Removing and adding an account on a new one did not help, as well as setting up an account on another device, incl. on Android. There are no such problems with the other Exchange account.

UPD: Decided by deleting all calendar events and restoring back from a backup.