Hello Bruno,
You cannot use XValue and XCategory simultaneously.When using XValue items will be placed at the corresponding position along the X axis,
XValue should be double or DateTime. Using XCategory forces the chart to arrange the items in a sequential manner and to create a category for each item. With a large amount of data using XValue is the appropriate choice.
You can send us a sample application, which demonstrates the issues you've encountered, by opening a support ticket and attaching it. This way we would be able to assist you further.
Regards,
Nikolay
the Telerik team
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