Hello,
I have a very strange and disturbing Moodle issue I am trying to figure out. It is hard to describe well, as I am not entirely sure what is going on, but I'll do my best.
I have a Moodle course that has a little over 90 quizzes, all of which grab randomly from 90+ question bank categories. Quiz #1 grabs randomly from question bank category #1, etc.
The instructor contacted me, because when he went to update quiz #73 (a.k.a. Q73), he noticed that it was grabbing questions from category #74. Then he looked at an student attempt made to that quiz earlier in the summer and saw that the attempt indeed used the correct pool of Cat #73. At some point, the random question pool changed--although the log does not show anyone even looking at that quiz between the student attempt and the instructor going to update quiz #73. Meanwhile quiz #74 started to pull from some questions from banks #73 and some from banks #75. Again, attempts show that quizzes #73 and #75 were correct earlier in the summer, but there are no logged changes to those questions to account for this.
This is on Moodle version 3.2 In trouble shooting, we restored to a version just before we did a minor upgrade from 3.2.3 to 3.2.4 to see if that might have somehow been a cause. The quizzes were correct, just before the upgrade. However, the instructor then looked at an almost identical course site he used last year's on Moodle version 3.0 (it is still up, on a separate server). He noted that some quizzes on that had also switched on the Moodle 3.0 site.
Looking at the log, it seems that there may be a correlation with these changes and edits of the quizzes in the rows above or below the corrupted quiz. The instructor wrote, "By using 'review attempts' I discovered that the change happened between Nov 13 and Nov 15 of 2016. All the attempts from Nov 13 or earlier correctly had the three random Q74 questions, and all the attempts from Nov 15 and later had the incorrect mix of Q73/Q74/Q75 (these are easy to spot because there was only one question in the Q73 set [so it wasn't really a "random" question], and it contains a picture of an IR spectrum). I looked at the logs for activity in the Q74 quiz, and there was nothing at all on November 14, and nothing suspicious (i.e. no activity by me or any other person with teaching privileges; just attempts by students) on November 13 or November 15."
Although I did not see any log activity for KQ74 either, I did find that the instructor edited Q73 on November 13 and November 14. Strangely, I found similar activity in the neighboring quizzes around time frame they seem to have become corrupt. However, I have yet to be able to replicate this issue, even in a newly restored version of this particular class.
I am totally stumped on how to proceed with this, but having quiz questions spontaneously change is highly disturbing. I welcome any insights or suggestions you may have.