You're only showing the id of the final marker in the "clickedMarkers"
array.

Instead, you probably want to buffer up all the ids in an array and then
separate them with <br>s. Something like this:

google.maps.event.addListener(markerCluster, 'clusterclick',
function(cluster) {
  var center = cluster.getCenter();
  var size = cluster.getSize();
  var content = [];

  var clickedMarkers = cluster.getMarkers();

  for (var i = 0; i < clickedMarkers.length; i++) {
    content.push(clickedMarkers[i].id);
  }

  infoBubble.setContent(content.join('<br>'));
  infoBubble.setPosition(center);
  infoBubble.open(map);
});

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