This applies to the Partial Credit feature for Multiple Choice Single Correct question type. When a Correct Answer is designated, the value is set to 100 and the field is non-editable. Clicking the 'Reset Score Values' link changes all Value fields to 0, but the correct answer is still non-editable. The user would have to click the correct answer radio button to get this value back to 100, which is not an intuitive action. It would be preferable to only reset the Value fields that are not the correct answer and leave the correct answer at 100.