One is that you haven't taken enough credits. In this case, as long as you complete enough credits within six years, you can get the diploma. As for the saying that you will not be given a degree certificate if you hang up many classes, who told you that there is no basis? As long as you pass the retake, you can only retake a course three times, and the third time is too bad.

Another is that he made a particularly big mistake. If he is punished and not revoked, he will not be allowed to graduate.

You'd better call the Academic Affairs Office of Haida University and ask more authoritative questions. The teacher is of good quality and will answer.