Clicking on one item in a group changes other items to "visited" state

It's the built-in function of the Visited state that is causing the problem. For each step, for both the picture and the oval, edit their states, choose Visited, use the pencil icon to rename "Visited " to something else. SL will automatically change all the triggers that use that state from "Visited" to the new name. In the process, you lose the built-in change to Visited when clicked, but since that is what is causing the problem, you don't care. Since you already have triggers to change the state , you should be good to go. See buttons 4 - 6 in the attached version.