Telerik Reporting is using the same engine in order to create full-featured report definitions. So, it have to be some differences between the report definitions used in Standalone Report Designer
and Visual Studio Report Designer
that produces different output when the report is rendered.
Based on the provided screen shot, I assume that the data field type in this report definition is set to String,
because it looks like they are concatenated with the SUM() aggregate function
In order to avoid it, I can suggest to use conversion function CDbl(expression)
to convert the field values to Double.
But if it possible to change configuration of the DataSource
, you can change the type of the column there.
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