Not an AE issue. Something is different/ wrong with your audio file. From the looks of it you use a mono or a 2-channel, but non-streo file. In both cases the waveform would be correct.
Thank you for your reply !
I've tried different .wav or .mp3 files and -> they all have the same graph.
When I play the Audio files in AE -> they all sounds correct / there's no problem.
It's just the Waveform Display is different.
Gosh, thank you =_=
Was looking for this for hours.
Thanks so much dude!! I have been looking for this for ages!
Thank you - I've spent ages trying to figure this out too