Hello RohitKatarya7,
I took a closer look at the problem, and it is most likely a bug. Here is related GH issue:
https://github.com/highcharts/highcharts/issues/11796
It had been closed a while ago but I have just reopened it. As you can see, there is a suggested workaround in the issue, but when I tried to apply it to your case, it turned out that the results are not great, because of number of points.
Demo: https://jsfiddle.net/BlackLabel/d9p15w7k/
I will talk with the developer who suggested that workaround in order to find something that would fit your case better. At the same time I encourage you to leave a feedback in mentioned issue, even short message. I wish I could help your more but that's all what I can do for now.
Regards!