Hello.. Please recheck this linkhttp://jsfiddle.net/qgHPJ/
Pay attention to the left part of the chart.. the visual distances between the bars is less than on the other part of it.. for example in the center distances between bars is bigger that on the right side of it.. because of this it paints the lines wrong.. it deforming the upper line(it must to be straight, not broken line).. You can see this if You try reduce the range at least twice - You will be able to see that this line displaying correct.. and with the full range it incorrect..
but I think the main problem, and the thing that cause all those problems that it displaying wrong the distances between the bars.. it's somehow squeezed in the right hand of the chart.. why is that? How can I solve this issue?