What is causing the discrepancy in functionality between these two HTML/CSS files with identical code?

In this codepen, you'll find the first example:

Subpar Pen: https://codepen.io/anon/pen/jGpxrp

Additionally, here is the code for the second example:

Excellent Pen: https://codepen.io/anon/pen/QqBmWK?editors=1100

I'm puzzled why the buttons labeled with "Yes" and "No" function properly in the "Excellent Pen", but not in the "Subpar Pen". On the surface, they seem to share identical code?

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