Electrical ground problem, buzz on Komplete audio 1

Leopold

Hi folks !

I've got a problem that is new to me. For a few months now, I feel like I have a ground problem or something with my komplete audio 1.
Every time I wanna plug a bass, a guitar, anything, I've got this weird buzzing sound that you can here on this video.

https://www.youtube.com/watch?v=QTfsRQ7Sx2A

I don't know where it's from, I've tried so many different option, but I don't understand where it is from !

Can anyone knows and can help me ?
Many thanks !!

Edit : I've got the same problem with a Scarlett Solo…