Hi Peter,
Sorry for the delay in updating you.
I was not able to reproduce the mentioned issue.
It is possible to update the series dynamically.
Please try the attached sample which helps you to update the existing points and to add the new points dynamically.
You need to set the AxisRangeType to Set to display the correct Range on the screen.
The following code illustrate this :
this.chartControl1.PrimaryXAxis.RangeType=ChartAxisRangeType.Set;
this.chartControl1.PrimaryXAxis.Range.Min=0;
this.chartControl1.PrimaryXAxis.Range.Max=10;
this.chartControl1.PrimaryXAxis.Range.Interval=1;
Kindly let me know if this helps.
Thank you for choosing Syncfusion products.
Regards,
Jaya
dynamicChart.zip