Does changing the order of questions reflected in past quiz results too?
Here is a copy/past from the answer to issue # 2862591

It depends on your revisioning configuration.
Out of the box, Quiz will version changes so that your old results are not affected.
If you were to change the Quiz/Questions in any way, you may see issues with reporting since the quiz and question version IDs have changed, so new users will be taking a different version of the Quiz. But, this means that all data is preserved.
If you turned revisioning off, reordering the questions or selecting &quot;random order&quot; should not affect old results or reporting as the question IDs remain the same. But you have to be more careful since changing something like removing an answer or question will definitely affect old results.
I'd suggest trying on a test copy of your DB just to make sure.

I'm posting this as a wiki answer, hoping for it to marked as accepted, so that this question is no longer considered as unanswered also.