Pjrostema

Hi all. I’m new to to keyboards and recently got my first, a 7600. I’ve noticed that if I press a key down but don’t let it fully return all the way “up”, and then press it down again, the key doesn’t make a sound like it’s been pressed again. It sounds more like the key has just been held down. Is this “normal”/expected or do I have a defective unit? thanks!