Stage changes automatically when due date is reached

In this workflow, at the stage Perform the activity https://solidenglishschool.1b.app/admin/shop/workflowstatus/54/action/new/, there is an action to set the end date of the process and the action Close after the end date, but after the date completion, the process automatically moves to another stage of the process, but there is no action to change the status, can you please answer what is the reason for moving to the stage after completion Step Transition Examples https://solidenglishschool.1b.app/4189/ https://solidenglishschool.1b.app/4206/