This might happen when the chart is in the ItemTemplate of an ItemsControl. If this is the case -- you will need to update the axis values manually in code.
However, if that is not the case the chart works as expected on our side. Please, find attached a sample project, which updates X-Axis properties correctly. Could you, please, give it a try and see if you're still experiencing the same issue.If so, it would be very helpful for us if you could modify the attached application so that the updating problem is reproducible for our developers to investigate and provide further assistance.
Thanks in advance.
the Telerik team
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