Menu and Slides arent matching

I am not sure why this is happening. The slides are jumping around in the menu. 
I started investigating it more and found out that the slide numbers aren't matching the numbers in the menu.
For example: in the picture below. Slide 1.12 Overview displays as Slide 1.9 Topic Areas in the menu. It should indeed be Slide 1.12 Overview as it is the branching slide for learners. 
Also why is there 2 1.9 Slides Ethics and 1.9 Topic Areas. 

Can someone please help me with this. 



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