Chart is Aggregating Same Descriptions but different material numbers

I have a chart that I am trying to create with a filter on Material numbers. But some of the material numbers have the same description. I want the ability to filter on multiple materials and have the cluster chart display a bar for each of them. But since they share descriptions at are the same, the chart is combining them into 1 bar. I would like them to be separate bars even if the descriptions are the same.