Weird sounds MIUI 10 8.9.20 Mi6

[eidoil32]

Hi,
I have an issue on my Mi 6, MIUI 10 v8.9.20,
Even in silent mode, the keyboard and buttons (menu and back) make week sounds, sound like metallic/electronic sound, can't describe how it's sounds but it's very week, i tried to turn off all sounds, nothing helps...

If someone knows how to turn this off..
Thanks.

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[frofa]

which keyboard app do you use?

 

[eidoil32]

I'm using SwiftKey, but I mute any sound...but i do writed that the sound is even when i press the back, menu and home buttons.. Now i can't hear nothing, it could cause when i plug to charger? (and some time after charge...)

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