I am trying to analyze my quiz statistics, but many students are missing from the report. In fact, entire sections do not have quiz statistics for their completed quizzes. Out of 150 students, only 15 students have not submitted their quiz. Out of 135 submitted quizzes, only 19 quizzes have quiz statistics with only 3-5 submissions showing up in each of 4 out of 12 sections. No single section shows statistics for all quiz submissions within that section. 8 of 12 sections show no quiz statistics for any submitted quizzes.
This worked out just fine when analyzing quiz statistics for the previous 6 quizzes I have given, but now when I look at those statistics multiple submissions are missing from all quizzes. For example I analyzed a quiz one month ago with 81 submissions which all showed up in the quiz statistics. Now only 35 submissions have quiz statistics for that specific quiz.