Hi Bobby,
Apologies for never reply back to you.
I think I found the problem.
So let say for assignment A, we put the due date for 29/06/2020 at midnight for example, but then the trainer realize that the student won't have enough time to finish it so the trainer change the due date to next week 06/07/2020. BUT, if the student already take the assignment before the Trainer extent the due date, then at midnight 29/06/2020 the assignment still automatically submit it.
So in conclusion, if the students are already take the assignment, even if the trainer extent the due date later, the initial due date won't change.
I was having a lot of complains from the students but I just couldn't find any relevant information online so I did a few testing and found out this is the case.
Hope it will be helpful for you if you encounter any similar cases
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