The User has a Human Resources role.
Steps to reproduce
1. Go to the Roster screen
2. Right click on a Person's User Leave (e.g. the "blue Anl" bar with a "yellow question mark" on its right) in the calendar
3. Select the "Edit" menu
4. Change the Status to "Approved"
Approve and Decline buttons are not shown on the Edit Person's User Leave screen.
This issue has been escalated to our developers and we are working towards providing a solution. If you have any questions please do not hesitate to contact Support.