Below are a few steps that may help sort out the order of events on the mobile calendar:

1. Check the settings for the calendar on the mobile device.
2. Make sure that you are signed in with the same Microsoft Account on the mobile device and the web calendar.
3. If needed, update the calendar settings on the mobile device, such as date range, time zone, and view type.
4. Update, re-install, or download the latest version of the app.
5. Restart or reboot the mobile device.
6. Contact the app publisher or Microsoft Support for further assistance.