Unwanted line chart ''shadow" using chart.js - javascript

I am using ng2-charts which is an Angular charting module based on Chart.js. I am facing an issue where there are unwanted "shadow" kind of while rendering the chart as shown in the screen shot. I wonder if there is any chart option that I need to tweak on in order to remove it.
Thanks]1

I managed to get rid of it by setting stacked option to false

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It's seems preety complicated to achieve that with amcharts becuase they are preety robust.
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