Result value issue

Hi experts,

In my query I have Customer, Sales doc, Item, GI date on the row and two cal.KF and several KFs on the column. At the inital run the Result values are correct, but once I remove the char. Item from the drill down then the Result value are wrong, I have set the Calculate Result As Summation on those cal.KFs

Could you advise me how to solve this problem ?

Thanks in advance