Hi Peter,
Greetings from Syncfusion. We have analyzed your query and we would like to inform you that, the multiple points will be stored, and all the provided data will be plotted on the chart.
We have also attached the sample with exact same x and y value for you reference.
If this is not your scenario, kindly get back to us with more information on your query regarding same x and y values and how you need to behave.
Regards,
Yuvaraj.