First Object doesn't change state

Hello

I have a slide with 5 buttons that provide additional information about a topic. All buttons have the same states (normal, hovering, visited). All buttons work and change their state accordingly, except for the first button that the user clicks. Why doesn't the first button that is clicked change its state to "visited"? It is not a specific button. It will be the button that was clicked first.

Any help would be greatly appreciated. 

Thank you for your help.

Andy