about tasks...

It had not happened to me. However, I think that it may be because you had submitted it after the deadline is over. They have an allocated time frame for each of the tasks given. For example, for a writing task, you are allocated 8 hours to finish and submit to them. If you exceed the time frame they had given, it will be treated as you had abandoned the task. Well, if it's really the above scenario, I will say that there is nothing you can do. You just have to be careful and take note of the allocated time given to you, and finish the task before the deadline.