On my test quiz, I see:

Questions per page has been set so the paging is currently fixed. As a result, the paging controls have been disabled. You can change this in Update this Quiz.

Update this Quiz: Shuffle questions: No | Questions per page: 1

However, the control 'Move selected questions to page:' is not disabled.

My quiz contains 4 questions. If I select question 4, and say move to page 2, then actually it gets moved to the end of page 1.

I would expect either that control to be disabled, or for it to do what the caption says.

Questions are still moved to the wrong page, even after I change the quiz settings to allow manual page breaks.