Audio a little distord when playback speed is increased

[sanjibukai]

Hello,
When I increase the playback speed to 2x, I'm experiencing a little distortion in the audio.
In fact it's obvious to get a "distortion" due to the speed.. But I'm not referring to this..
The pitch seems to be preserved (so there is no high-pitched sound) but there is some kind of high frequency (like if there was some "inertia" in the sounds - I don't really know how to describe this though) which is really annoying..
I'm used to watch videos at 2x speed (eg. on YouTube) and I don't hear this kind of sound.

What's let me write this issue though, is the fact that the same videos at the same 2x speed played on VLC didn't produce this kind of sound.

So is there a way to adjust the engine that plays the audio?
I really want to fix that since bomi give me a really good suer experience compared to VLC..

Thank you very much.