Hi Henry,
Thanks for contacting Syncfusion Support.
We suspect that you are adding Radar, Column and Pie series at the same chart. We would like to clarify you that we have different types of series and there is some limitation when combining series types in the same chart.
The Polar and Radar chart can’t be combined with any other chart because its axis perspective is different when compared to XY series like column, line etc. At the same time, accumulation series also cannot be combined to any other series, it does not need an axis at all. If you combine means, it will always render the first series which is added to chart.
Please refer the below link to know more about combination of series types:
If your scenario is different from the above explained requirement, please revert to us by modifying the sample to replicate the issue at our end.
Regards,
Rachel.