Changing Slide numbers as generated by Storyline

I'm encountering a situation where I've built a course and it seems that the numbers generated by storyline seem to change for what appears to me no apparent reason. I realize that to the learner this does not matter since they will never see theses numbers but I'm using them to keep track of audio I'm recording and know exactly what slide goes with what audio track. Why do they change numbers and is there a way to fix this? 

 

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