Thank you for contacting us on that matter and providing us with detailed information about your scenario. I managed to track the behavior that you report down. The reason for that rendering is the fact that you actually create all your points with the same category. Hence, the reported layout is expected.
The reason for this is the DateTime.AddDays() method. Please note that it returns a new instance with the added day. It does not change the already created DateTime instance.
Please make sure that the category that you set are different and try the RadCartesianChartcontrol again.
Pavel R. Pavlov
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