We suppose that your Report is bound to a data source (Report's DataSouce property is set). If so, this is the expected behavior - as explained in the Understanding Report Sections
help article, the detail section is printed once for every row in the data source and it is the section where you place the report items that make up the main body of the report. Thus all items placed in the report detail section would be repeated as many times as the data rows in your database.
The easiest solution is to unbound the report , thus its single detail section would not be multiplied and you would have only one detail section shown with your table.
the Telerik team
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