Below is a video with some information on how this can occasionally occur and a solution to set the Lease to "Inactive" which will remove all existing jobs on the Job Schedule.  Then you can change the Lease back to "Active" which will then offer a prompt at the bottom of the Job Schedule to Add a Job on an Auto Haul Lease that is not currently on the Schedule.

Please Download the attached Video for Instructions on Removing Duplicated Auto Haul Leases from the Job Schedule.