Hello everyone I bought a Roland FP 30 earlier this week and I am encountering this strange sound when the black keys rebound. It is all the black keys, I am afraid because I am beginner and I am not sure if I am not suppose to let go of the keys that suddenly on a fast piece.
https://streamable.com/080mw
I asked on reddit and most people said it was a defect, what can you tell me about it.

It's a defect for sure. If you bought it new bring the piano back and replace it.