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you need to set Y-Axis to start with 0, by default it start with the minimum value present in the data set which is 4 in your case. Due to this last 2 columns with value 4 are not visible.
yAxes: [{
ticks: {
beginAtZero: true
}
}]
updated Pen : http://codepen.io/anon/pen/LxxVBp?editors=0010
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The y-scale on your graph has a minimum of 4.
The value of your last 2 points is 4, so they are not shown.
Set the min to 0, or at least less than 4 and they will show.
Source:stackexchange.com