Pick One - the states not switching off

I have created a Pick One scale.  When you preview the slide, you click on one option and the state changes to show it is selected.  But if you change your mind and want to change your answer, when you click another one the state on the first selection still shows as selected.  In fact you can click on all of them and they will show the selected state.

I need only one to show selected - any thoughts?

I've uploaded the slide.

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