Audio / Animation do not sync after uploading to server (HTML5)

When I test the course (HTML5 version with Google Chrome) after publishing it on my computer, the audios and animations sync perfectly. However, the problem occurs after I upload the course onto the server. I test the course (HTML5) again, plays only first animations along with audios in each slide (layer) - the rest of the animations won't play until the audios end!   

I wonder if anyone know how to fix this?

Appreciate that! 

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