SUMX wrong Subtotal

Hi all!

I have a simple calculation of #Orders * Price. This data is displayed on a matrix visual with all articles. We receive a Subtotal for each department but it seems to be wrong.

I tried this formula but on Article level it works and for totals not.

Revenue = 
VAR _NumO = COUNTROWS('Orders')
VAR _Price = [Price]
RETURN
SUMX(VALUES('Master'[Article]), _NumO * _Price)