Our development team is aware that the RadChart configuration wizard may behave problematically in some specific scenarios (even). Generally it is recommended that you configure the chart manually in such cases. You can use Visual Studio Properties Window to do so, or you can edit the .aspx page directly.
As a workaround to this problematic behavior, I would suggest to resize the chart just a little bit by dragging one of its corners, for instance, the lower right one. This way, all changes from the wizard will be applied.
Sorry for the caused inconvenience.
Otherwise, for further details what can be done manually in the .aspx page or in the code-behind, please, check our vast collection of online demonstrations with source
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Please, let us know, if you need further help.
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