Object state "if" condition being ignored on show layer trigger in drag and drop?

You don't need triggers to set the 'Visited' state. It's a built-in state that activates automatically when a button is clicked. Remove any triggers that manually set the "Visited" state, and keep only those that show a layer when a button is clicked, but only if the button's state is "Normal". 

Keep in mind that, in this case, the learner will be able to open the layer as long as the button hasn't been clicked—meaning it can be dragged and returned to its original position, but the layer will still open unless the button is clicked at least once. To ensure that the buttons are clicked and layers opened before they can be dragged requires a different logic and setup.