Audio volume changes on playing other sound

Files in a blank project uploaded here:

discord.com/channels/116497549237551109/225550155531812865/774683304010973234

Or

drive.google.com/file/d/15ueNAeMb25-q4k0fZN1kABEpAkhXZ8Fj/view

There are some events that explain what to do. Just click mouse to play a sound, then the one already playing changes his volume. But if the one on click mouse has -21 volume ,etc... then is ok.... ¿?

Same on C2 and C3. No idea if is a bug or maybe this audio files have some special that affects to the audio plugin ¿?

Ah, well I can't understand the problem, I use a google translator to read it but I still think it is not well explained.

The problem is that when you click the mouse to play the pistol sound, the other sound playing in a loop (Fridge) reduces his volume to half aprox. with no reason.

In fact, if on pistol you set -10 on volume, it should recude sound to half, but it still sound max. Maybe there is something in the audio files ¿?

But on start layout, the volume of that sound is ok, you can hear the sound perfectly.

On click the mouse, the volume suddenly goes to half, and it starts to increase the volume gradually to the original volume before click the mouse button.

I cannot reproduce the supposed error and I repeat myself, the sound has very low volume from the beginning.

Why doesn't it record a video playing the error?