by the way
I check the original data, these 2 profits is -0.44 and 0.74
but, if I do not change the Number Format, and export to csv file from the view data dialog，then i will get "0" and "1" in CSV file, and this why I think it is a error（I check data via exported file）.
For Excel，display value will not change the actual value，This is what 『Drill-down』should be.
Maybe Tableau should "export the actual value", not "display value".