Hello NAC,
Welcome to Storyline authoring! I appreciate you sharing a detailed description of your experience and the accompanying screenshots.
Based on what I understand, it looks like Storyline is executing the "Show layer" trigger when it jumps back to the slide. Can you add the following trigger to the base layer and see if it helps?
If the issue persists, it would be helpful to see the Storyline project file so we can better assist you. Would you be willing to share it in this discussion so we can look at what you have set up? You may also share it privately by sending it along in a support case. We'll delete it when we're done testing.
