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This is a simple HTML problem. You define the radio buttons with the response.correct
value, which is undefined for the incorrect options and also identical for both (no matter if it is null or false).
Your output might be like this:
<input type="radio" name="index">Incorrect
<input type="radio" name="index">Incorrect
<input type="radio" name="index" value="true">Correct
If you have a group of radio buttons and several have the same value (or none), these are basical the same input. Try to define a unique value for each radio button with the same name.
Source:stackexchange.com