Possibility of "stopped viewing quiz-taking page" the result of backing up to previous questions?

[VickiHanes]

I've never seen this notation on previous tests in the moderation page/activity logs.  I've checked the community and see that there are two reasons for this notation. 1) clicking off the page 2) inactivity of more than 30 seconds.

I've checked and the latter is not the case. I don't want to accuse students of cheating without understanding if there might be other reasons. I do allow students to revisit previous questions and some of the leaving is at the end of their test. I just want to make sure that reviewing previous questions is not the reason for that notation.

Thanks for any help.