@eshan_23,
To form a closed shape using area chart, the datapoint must be in a sequence making an enclosed shape. It seems like after a certain datapoint, the rest are not in a sequence making an enclosed shape. Kindly take a look at this updated JSFiddle which shows till which datapoint the charts seem to be rendering fine. Having a sequence for the rest of the datapoints should work fine in your case.
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Adithya Menon
Team CanvasJS
