[Solved]-Highcharts 3.0, area chart with stacked and unstacked series - how to fix?-Highcharts

Ok, solution:

I had been setting the stacking:normal at the series level in the plotoptions, and disabling it on a series by series level as needed.

I have instead removed the stacking setting from the plot options, and instead only set it on a series by series level as needed.

Problem went away.