When you duplicate the nodes and then duplicate the keyframes you make that maneuver so fast I can't follow it.
There are courses that focus on the fundamentals if you feel you need to step back a little bit. Remember this sets of lessons in Sessions are more about concepts, compositions or artistic endeavor, not so much focused about how Blender the software works. So if you're feeling a bit overwhelmed, it's a good idea to stop if you need to and get back into Sessions later. Cheers 🤙