Hi Inhyuk,
Thank you for pointing out this problem - it is caused by the ordinal scale on the x axis, which currently cannot handle long values as it is usually used in categorical charts that typically have values in the range 0-1000. To work around the problem you can switch the X axis in linear mode:
m_Chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator = new NLinearScaleConfigurator();
We have fixed the issue in the upcoming SP of the component.
Best Regards,
Nevron Support Team