Why is it printing a list with every second item blank? I cannot figure this one out.

var asking;
var correct = 0;
var incorrect = 0;
var assessment;  
var qAndAs = [
  ['Who is the All Blacks current captain?', 'richie mccaw'],
  ['What rank are the All Blacks?', 'first'],
  ['Where is the next world cup held?', 'england'],
  ['Who was the previous All Blacks captain?', 'tana umanga'],
  ['Who won the last world cup?', 'all blacks']
];
var right = [];
var wrong = [];

function print(message) {
  var outputDiv = document.getElementById('output');
  outputDiv.innerHTML = message;
}

function wRList(arr) {
  var wRHTML = '<ol>';
  for (var i = 0; i < arr.length; i +=1) {
    wRHTML += '<li>' + arr[i] + '<li>';
  }
    wRHTML += '</ol>';
    return wRHTML;
}

for ( var i = 0; i < qAndAs.length; i += 1) {
  asking = prompt(qAndAs[i][0]);
  asking = asking.toLowerCase();
  if ( asking === qAndAs[i][1]) {
      correct += 1;
      right.push(qAndAs[i][0]);
    } else {
      incorrect += 1;
      wrong.push(qAndAs[i][0]);
    }
} 

assessment = '<h1>Here is how well you did.</h2>';
assessment += '<p>You answered ' + correct + ' correct and ' + incorrect + ' incorrect.</p>';
assessment += '<h2>You correctly answered.</h2>' + wRList(right);
assessment += '<h2>You incorrectly answered.</h2>' + wRList(wrong);
print(assessment);