The new scheduled alerts are not listed in 'My Alerts', though the reports are delivered to the recipients. Why?

The new scheduled alerts are not listed in 'My Alerts', though the reports are delivered to the recipients. Why?

Remove the old alert entries from the tables- 'ADMIN_ALERTS', 'ADMIN_ALERT_STATUS', for the new alerts to get displayed in 'My Alerts'. Sometimes the old alert entries in the table induce problems, when retrieved from the DB.