After some research I discovery that: the buttom background used to state "hovered" and "selected" is the same, and because of that you see more than one button selected, but the real situation is that only one button is selected the other one has the sate of "hovered".
I saw 3 options here to solve the problem:
1 - Not draw the background when the mouse is over the button (in hovered state).
2 - Create a new image/effect to be used when the button is in "hovered" state
3 - Change the state of button to selected when move the mouse over the button (I do not like this option)
After some research I discovery that: the buttom background used to state "hovered" and "selected" is the same, and because of that you see more than one button selected, but the real situation is that only one button is selected the other one has the sate of "hovered".
I saw 3 options here to solve the problem:
1 - Not draw the background when the mouse is over the button (in hovered state).
2 - Create a new image/effect to be used when the button is in "hovered" state
3 - Change the state of button to selected when move the mouse over the button (I do not like this option)