1👍
OK so the problem is you are setting both your axes to stacked:true
which will force ChartsJS to "add" the values together. to get them to "overlap" you need to set Y Axes to stacked:false
like this..
CartesianLinearAxes xAxes = new CartesianLinearAxes();
xAxes.setStacked(true);
cScales.addXAxesData(xAxes);
CartesianLinearAxes yAxes = new CartesianLinearAxes();
yAxes.setStacked(false);
cScales.addYAxesData(yAxes);
Source:stackexchange.com