It would help if you could attach your workbook. However, from the screenshot I can see on your screenshot that you have Haipu Category as a color on your Haipu Count Axis Marks card. This will create a mark for each category. Remove this from the Haipu Count marks card (but don't remove it from the average marks card). Also, you may want to change the Chart Type from Map to Line here if you want a line.