谷歌地图API只显示了4个标记中的3个

我有这段代码和多标记设置应该正确工作它设置在一个数组中，我循环它们，但问题是我在我的数组中有4个项目，它只给了我3个，这对我来说似乎很奇怪，因为它应该通过所有的

    /*array for locations below */
var locations = [
  ['<h4>Kingsley Recruitment Liverpool <br/><br/> 11th Floor, The Plaza<br/> 100 Old Hall Street <br/> Liverpool <br/> L3 9QJ <br/> <br/> 0151 242 1630</h4>', 53.4109146,-2.9947334999999384],
  ['<h4>Kingsley Recruitment Manchester <br/><br/> Centurion House<br/>129 Deansgate<br/>Manchester<br/>M3 3WR <br/> <br/> 0161 393 9889  </h4>', 53.479798  -2.2479048],
  ['<h4>Kingsley Recruitment London <br><br> Warnford Court <br> 29 Throgmorton Street<br> London <br>  EC2N 2AT <br><br> 0203 817 7030</h4>', 51.5074, 0.1278],
  ['<h4>Kingsley Recruitment Birmingham</h4>', 52.48208 -1.9027578],

  ['<h4>Kingsley Recruitment Leeds <br><br> West One <br> Wellington Street<br>Leeds<br>LS1 1BA <br><br>0113 887 2170 </h4>', 53.8008 , -1.5491]
];
// Setup the different icons and shadows
var iconURLPrefix = 'https://www.google.com/intl/en_ALL/mapfiles/';
var icons = [
  iconURLPrefix + 'marker_black.png',
]
var iconsLength = icons.length;
var map = new google.maps.Map(document.getElementById('MAPS'), {
  zoom: 6,
  center: new google.maps.LatLng(52.6369, -1.1398),
  mapTypeId: google.maps.MapTypeId.ROADMAP,
  mapTypeControl: false,
  streetViewControl: false,
  scrollwheel:false,
  panControl: false,
  zoomControlOptions: {
     position: google.maps.ControlPosition.LEFT_BOTTOM
  }
});


var infowindow = new google.maps.InfoWindow({
  maxWidth: 160
});
var markers = new Array();
var iconCounter = 0;
// Add the markers and infowindows to the map
for (var i = 0; i < locations.length; i++) {  
  var marker = new google.maps.Marker({
    position: new google.maps.LatLng(locations[i][1], locations[i][2]),
    map: map,
    icon: icons[iconCounter]
  });
  markers.push(marker);
  google.maps.event.addListener(marker, 'click', (function(marker, i) {
    return function() {
      infowindow.setContent(locations[i][0]);
      infowindow.open(map, marker);
    }
  })(marker, i));
  iconCounter++;
  if(iconCounter >= iconsLength) {
    iconCounter = 0;
  }
}
function autoCenter() {
  //  Create a new viewpoint bound
  var bounds = new google.maps.LatLngBounds();
  //  Go through each...
  for (var i = 0; i < markers.length; i++) {  
    bounds.extend(markers[i].position);
  }
  //  Fit these bounds to the map
  map.fitBounds(bounds);
}
autoCenter();