Audio Specific sound doesn't play correctly on mobile device

I have a short (gun) reload sound playing in my game. It's sounds weird on my OnePlus 6 (Also Samsung Galaxy A5). It sounds normal on a Nexus 5X.

Here is a sample recorded directly from my OnePlus 6 (it's recorded using the phone's microfon):
https://vocaroo.com/i/s0DXdEdJ8PVA

The first three reloads are IN GAME. The other are from a soundplayer on my OnePlus. The Player produces the correct sound. All other samples in the game sound correct.

What can be the issue here?! This is really weird. I used the same .apk on all devices. Only the Nexus 5X plays the in game sound correctly.

Edit: On my PC it also sounds okay.