I'm glad you enjoyed your time with the game enough to see all the endings, a1anne. That means a lot to me knowing people are liking it that much. While it's true Digsby does have some unique talents for players to discover, cloning Morty is definitely not supposed to be one of them! Nice catch. A screenshot would be appreciated so I can narrow down which instance of Morty is appearing when he shouldn't be.
Also if you happen to remember what you were doing at the time you saw that happen, that may also help me figure out what's going on with it. Were you in the middle of Trudy's requests? Or maybe you hadn't started it yet or already finished it? Did you leave the study and come back in again right away? Any other small details like these that you may be able to remember would be helpful as well.