Changing states of Buttons on Main Menu

OK, here is my dilemma.  First I created 6 buttons on the slide master to control navigation in my course.  One of my objectives was to have a Selected state when the learner was on a slide contained in "Button 1" for example.  I quickly realized I could not do this from the slide master.  So, I placed the buttons on each individual slide (I'm sure I'm not being very efficient here).  That worked, so that I could set the Selected state for each slide depending on where that slide was within the menu structure. 

Now here is my problem.  If i click back to a previously visited slide, I get 2 buttons showing the Selected state,  If I visit a slide a 3rd time I get 3 buttons showing the Selected state, etc.  So, does this indicate that I need to change the Slide Property, When revisiting to something other than Automatically Decide.  Or is there something else I am missing that is causing this unusual behavior?