AirPods Pro Loose Noise on the left AirPod

Since one week my left AirPod makes this weird noise when I have it in my ear. It does not happen when it is outside of my ear, I even tried switching left and right which was kind of weird, but that is not the point, it didn’t make this noise anymore. I have no idea what this, it only happens when I move my head, maybe even kind of shake it, or touch the AirPod itself. Sounds like it isn’t a huge problem, but when driving scooters it appears and it’s not a nice sound.

Would be pleased if anyone else has this problem and found a way to fix it.

I already tried cleaning, disconnecting it and switching between sizes, but nothing helped.