PBCS Smart view Drill-through output incomplete

I use smart view ad-hoc data from PBCS, and drill-through a cell, it is successful, I checked the output, the result is not incomplete, and less than the original data before drill-through. I drill-through from BU level, and the output is store level(store is the base member of BU, they are under entity dimension). In the output file, I checked the total amount on the store and found that it was significantly smaller than the figure on the BU. I also checked the workbench data, the workbench data is store level, and I have summarized the stores under BU, and