Troubleshoot Charts (Report Builder and SSRS)
These issues can be helpful when working with charts.
You can create and modify report definitions (.rdl) in Report Builder and in Report Designer in SQL Server Data Tools. Each authoring environment provides different ways to create, open, and save reports and related items. For more information, see Designing Reports in Report Designer and Report Builder (SSRS) on the Web at microsoft.com.
Most chart types require numeric values along the value axis, which is typically the y-axis, in order to draw correctly. If the data type of your value field is String, the chart cannot display a numeric value, even if there are numerals in the fields. Instead, the chart displays a count of the total number of rows that contain a value in that field. To avoid this behavior, make sure that the fields that you use for value series have numeric data types, as opposed to strings that contain formatted numbers.