Hi, Thank you for your question!

The folder where a task is located depends on its start time, not due date (deadline). But if there is no start time of a task, the task will enter Today folder automatically when its due date (deadline arrives).
So when you change the due date (deadline) of a task, it may or may not affect its folder, it depends on the above condition.

If you still any have questions, please just tell us. We are glad to help.
Have a great day!