Two fact tables with different grain levels wrong results in Query/Report studs

I have two fact tables with different grain levels: F1 and F2 they are connected in the following way:
F1 (1..1) – Key_id1 – (1..1) Dim1 (1..1) – Key_id1– (1..n) F2 (1..n) – Key_id2 – (1..1) Dim2
Determinants:
F1 – Unique: Key_id1
   Dim1 – Unique: Key_...