Seeded and custom notification sent for a performer from alert composer.

Hello,

We have a requirement to notify the performer (Employee) when one of the onboarding journey tasks is assigned. We have created our custom notification in 'Event Alert - Task Assigned for Performer' of alert composer. Reminder to be sent on every 1 day and repeat 1 time after assigned date.

Yesterday we hired an EE and found that our custom notification was sent to an EE when onboarding task was assigned as expected. But today we found that seeded notification was triggered instead of our custom notification. Please suggest why the seeded notification was sent instead of custom one.

Please find the attached document for your reference.