Power BI - Distinct Count not working

Hi, I've a Pie chart on my dashboard in Power BI. The Pie chart is based on the column that inlcudes duplicates. I have a card on my dashboard that shows me the number of distinct values in that column & also the total number values (no. of rows in excel). When I select "Count" the pie chart works well but when I select "Distinct Count", I expect the Pie chart to change values on only have the unique distinct in it. However, when totalling the numbers of the slices.