Problem with speed when you re-visit slides

Hi there, 

I have a problem with slides' speed when you re-visit them.

I have a storyline2 video with 4 tabs. Once the learner goes back to a tab he'd already watched (let's say from 3 to 2), the video "runs" super fast, not in the correct speed, and it jumps over slides that the learner already seen...

Any ideas why it happens? Any suggestions on how to fix it? (It happens both on preview mode and after publishing)




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