We recently upgraded from 2008 to 2012, with one of our applications running on an active & passive server (Always On). It has been running SQL Server Agent jobs twice at the exact same time.
We verified it wasn't the passive box, but we can't explain the trigger or reason(s) as to why its running twice.
Only one scheduled agent job appears. It is setup correctly to run 9:15 for Mon & Thu:
Occurs every week on Monday, Thursday at 9:15:00 AM. Schedule will be used starting on 10/9/2014.
By disabling the scheduled job running the SP on the passive server the day before, only the "active" machine was scheduled and able to run. Only the active machine ran and the results were correct: one email was sent, it was completed and the records were not duplicated; however, when we run the job manually through the scheduler it fails since the server is passive.