All views seem to show just the main tasks - NOT their sub-tasks. Clicking them opens the edit dialog NOT the sub-tasks list.
all sub-tasks should be displayed in the mobile version indented as they are in the web-app.
Please tell me - are you using the mobile site http://todoist.com/m our iOS app or any third-party app?
I'm using the mobile site. I have for example an overdue task which has three sub-tasks (one of them checked as done), but in the overdue view only the task NOT the sub-tasks are displayed.
I can't reproduce his issue. Even if only the parent task is overdue, I see all its sub-tasks in the overdue view. However, if one of the sub-tasks has been checked off it will indeed no longer appear there.
Also, if the checked off sub-tasks itself has sub-tasks on the next indent level, they also won't appear as they get checked off along with it.
Could you please make a screenshot of the sub-task structure in the project and then in the overdue view and send it to email@example.com ?