Maybe my question is quite simple but still I can’t see the way to solve it.
I create a task and add some subtasks to it. The due date of the parent task may periodically repeat. In this case when I mark the parent task complete (its subtasks may be marked complete or not), in a few seconds I can see the appearance of duplicates for its subtasks (can be seen on the picture ). As I see, some of these new subtasks are relevant for the updated parent task with a new due date and at the same time some of them appear as the copies of the previous completed parent task.
Please help to find the mistake in my task organization.