The fix is to change .text(n[0]) to .html(n[0]) in scripts.js line 220 in here:
$.fn.wpcf7RefillQuiz = function(quiz) {
return this.each(function() {
var form = $(this);
$.each(quiz, function(i, n) {
form.find(':input[name="' + i + '"]').clearFields();
form.find(':input[name="' + i + '"]').siblings('span.wpcf7-quiz-label').html(n[0]);
form.find('input:hidden[name="_wpcf7_quiz_answer_' + i + '"]').attr('value', n[1]);
});
});
};