Currently, tasks are ordered by their 'creation date' and 'Last Updated Date. This makes it unlogical for a user. Most users will complete their tasks in order of their 'Due Date'. A nice to have would even be to re-arrange them by dragging them in a correct order or so.
The screenshot below gives an example
Possible solution: Tasks should be made re-arrangeable by dragging.
Tasks should be shown due to their Due date,