Troubleshoot Charts (Report Builder and SSRS)
Applies To: SQL Server 2016
These issues can be helpful when working with charts.
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.