Audio syncing not working on iPad

I am using Articulate Studio 13 Update 2 to create courses in multiple languages and facing the syncing problem across the courses.

Animation is lagging behind audio on iPad. I have tried various settings including the ones given here Video Is Out of Sync With Audio in Mobile Safari. Optimized the image and audio files also. But, nothing seems to work. This problem is occurring only on iPad as the syncing seems to be working fine on desktop. 

Has anyone faced this problem? Any ideas to resolve? Thanks.

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