Several months ago, my daughter gave me a Yamaha YPG-625 digital keyboard that she had for maybe 10 years. This is the instrument that I am learning to play. Since I have never played a conventional piano, I have a general question. When the keys on my keyboard return to their original position after being played, there is a rather loud audible "clunk". I have assumed that this was due to the design of a digital keyboard. Am I correct or is this common to only certain digital keyboards like mine? Thank you.