When I go to drag a midi note within the Piano Roll it often creates a double note on the same pitch. One where the original was and one where I wanted the edit to be. For example, if I have a quarter note that I played a bit behind the beat and I drag it to the beat, the old one is still there as well. I am not sure why this happens most of the time but not all of the time. I don't want it to happen at all. Thanks in advance for your advice.