Rescheduled to delete more contacts in next off-peak period

In Kentico (9) when I run the task "Delete inactive contacts" it never actually runs and the result is always "Rescheduled to delete more contacts in next off-peak period"I've tried changing the settings to run once a week and I've tried creating a custom IDeleteContacts then setting it to use that custom class, but I always get the same result. Any ideas?