Bars alter their position with dynamic data load.

I have graph like http://c3js.org/samples/data_order.html, but with data1 non-grouped everything else is grouped. Whenever i am sending columns new data, the graph is loading as is. But at some times the single bar is going right of the stacked bar. I have tried looking by changing the rotation. its moving from up tpo down.

let: data1: bar, [data2, data3, data4, data5]: stacked-bar
1, [2,3,4,5] - inital graph
[2,3,4,5], 1 - after dynamica data load

This issue is appearing only few times after a lot many toggling.