I use the marathon UI to deploy apps. I don't know how the app's status becomes 'staged'. It always stays in 'staged' status. Then I destroyed it and want to recreate a new app. But the 'destroy' deployment cannot finish, its current action is always StopApplication. The I deleted the 'destroy' deployment, it just become another deployment and its action is ScaleApplication. And the app's instances' status is staged and never become running.