This is most likely cause by the Timesheet Notification Settings for the enterprise.
A notification is created for each event that has its conditions met.
When the following two events are setup, it will create a separate notification for each:
- Timesheet is approved and closed.
- Timesheet is approved by any Approver.
To change one of these settings, please follow the below steps:
- Open the enterprise admin module.
- Click on 'Timesheet Properties'.
- Click on Timesheet Notification Settings.
- Deselect one, or the other settings outlined above and click Save.
Please note you must be an admin to make these changes.