@ahmedali123,
Stacked Area Charts are Area Charts plotted together with aligned x values, such that at any point it shows a cumulative total of that point for all series. Because of this reason, the dataSeries will be shown at the value which is the sum of all its previous dataSeries.
Considering this thread as a duplicate of Chart is rendering but y axis is not proper and hence closing the same.
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Manoj Mohan
Team CanvasJS