Months double-up on x-axis in multi-line chart

[DaveR]

Running the following yields duplicate months along the x-axis (Mar & May appear twice each). Also, possibly as a result, data points do not position over the correct month in some cases:

var chart = new CanvasJS.Chart(“chartContainer”,
{

title: {
text: “duplicate months demo”
},
axisX: {
valueFormatString: “MMM”
},
axisY: {
valueFormatString: “#0%”
},
axisY: {
gridColor: “Silver”,
tickColor: “silver”
},
data: [
{
type: “line”,
showInLegend: true,
lineThickness: 2,
name: “Line 1”,
markerType: “square”,
color: “#F08080”,
dataPoints: [
{ x: new Date(2014, 0), y: 1 },
{ x: new Date(2014, 1), y: 5 },
{ x: new Date(2014, 2), y: 15 },
{ x: new Date(2014, 3), y: 25 },
{ x: new Date(2014, 4), y: 35 },
{ x: new Date(2014, 5), y: 45 },
{ x: new Date(2014, 6), y: 55 }
]
},
{
type: “line”,
showInLegend: true,
name: “Line 2”,
color: “#20B2AA”,
lineThickness: 2,

dataPoints: [
{ x: new Date(2014, 0), y: 3 },
{ x: new Date(2014, 1), y: 10 },
{ x: new Date(2014, 2), y: 17 },
{ x: new Date(2014, 3), y: 22 },
{ x: new Date(2014, 4), y: 30 },
{ x: new Date(2014, 5), y: 40 },
{ x: new Date(2014, 6), y: 50 }
]
}

]
});

What am I doing wrong?

Thanks.