Visited text appearing over other visited text

Hi there, Ive tried searching for an answer but no luck!

I presume that the resolution would be very simple although i just cant figure it out. 

My course has a slide which has various button to click on with text that appears when you click on the button. However when i test the module the text appears over each other so that you cant read. How do i correct this so that when you click another button it hides the previous text?

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