Order of slides in Scenes different on Preview

Whilst working on a project, I initially had Quiz slides after each chapter.  I later moved all the quiz slides to a separate Scene and saved the module with Scene 1 showing the information slides and Scene 2 with the Quiz questions only.  However, now when I select Preview Mode the quiz slides are still appearing at the end of each 'chapter' as I had done initially .  

Story View shows the Scenes correctly , but in Preview Mode the Quiz slides still appear after each chapter .  Refer to the attached.

I'm stumped as to why this is happening.

 

 

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