Video losing volume in Storyline depending on frame size?

Hi,

I'm trying to work with video in Storyline. For whatever reason every time I try and import video with a format 1280x720 for example the audio is so faint I can barely hear it. If I import the same video in 640x480 for example it works fine.The original video was shot in HD format 1280x720. I've tried every importing every format that my video editing software is capable of producing and it's the same with all of them. Tried avi, mp4, mov, wmv.

Any ideas because it's driving me insane?

Thanks

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