Why untaken quizzes have 0 grades for students

[YeSu]

Some quizzes are locked in my course and will be opened in week 6 and later in the semester. However, the grade book shows 0 for students, and the final grade takes these 0s into calculation, and all students fail the class. Students worry about their grades. I know these untaken quizzes usually show - in the grade book. How can I fix the problem? 

Thank you, 

Ye

[JeffCampbell]

Just a few things to clarify.

Has it been assigned?

Is there a due date on the assignment?

If you go to the submission for a student that has a 0, does it have a missing flag?

Do you have the option to autograde missing assignments turned on?

This is curious behavior. It should not be giving a zero automatically unless you have it set to given 0's to missing assignments, which does not occur until after the due date has passed. Hence the questions.

[BrianLester]

Following up on @JeffCampbell's response I would check if you have set the grading policy for missing submissions as automatic 0, and then check if your due dates are in the past. This caqn happen if you import material from a past course without clearing all dates