We are upgrading from Highcharts 2.3.2 to current version, and we have some problems with stacked area charts. The problem is that stacking:'normal'
behavior is not as expected when we have series that contain both positive and negative values.
JsFiddles:
Highcharts 2 - Desired Behavior, see chart 2
Highcharts Current - Unwanted Behavior, see chart 2
We have managed to fix this issue in charts that contain series with either only positive or only negative values, by using the stack
attribute on each series (see chart 1 in second JsFiddle).
Can anyone point us to a direction on resolving this issue?