Have you checked to see if your high school has overestimated their FAFSA completion rates?
Yes, I have checked and it seems as if they have indeed made an overestimation
One of the reasons that your submission rate seems low is that your school could be listed more than once, this can happen when a student enters your school name in a different way on the FAFSA form. If your high school name is listed under different names, then it could be listed in more than one place
Can I get help increasing my FAFSA completion number at my high school?