I just gave this a try and I wasn't able to reproduce it. I added deckstamp, stamped an image, deleted the deckstamp contraption, and then added a jankytunes contraption and it seems to be working as it should. Can you explain in detail what you mean by "when I open the JankyTunes contraption"?
Thanks for the reply! When I saw that it worked for you, I realized I must have done something wrong along the way that I could not account for. I started from scratch and ran into no problems, so still don't know what I did wrong. All I can think of, is that I have the JankyContraption code saved in Obsidian, and this time I copied straight from the deck.
I did just recently update the code in the deck, so it's possible that the previous version had some glitch in it? Or maybe it was the saved code? Anyway, glad it is working now! I am looking forward to seeing what you're using it for, and as I've said elsewhere please get in touch if you need help with like having JankyTunes autoplay or anything like that!