Thanks, but I’m talking about the stepLine series in my initial example (https://jsfiddle.net/joxautfc/ and https://jsfiddle.net/gbu4o1qv/) (not the area, stacked ones).
Why does “Series 1” at position 0 make all the other stepLine series disappear and everything is fine if “Series 1” is at position 1?
Thanks for your help!