Calculate with boolean filter and corresponding slicer not working

Hi all,

I have three measures counting rows in table:

• Nr Of Tasks = COUNTROWS(Tasks)
• Nr Of A Tasks = CALCULATE([Nr Of Tasks]; Tasks[TaskType] = "A")
• Nr Of B Tasks = CALCULATE([Nr Of Tasks]; Tasks[TaskType] = "B")

Then I have a slicer (filter) in the report with TaskType, I and get the following results when I use the slicer:

1. TaskType nothing selected: Nr of Tasks = 14; A Tasks = 6; B Tasks = 8;
2. TaskType A selected:           Nr of Tasks = 6;   A Tasks = 6; B Tasks = 7;
3. TaskType B selected:           Nr of Tasks = 8;   A Tasks = 6; B Tasks = 8;

I do not understand why B tasks drops down like this, in my mind the filter argument in Calculate should overwrite the slicer, hence always return 8, or am I wrong?

Regards,

Kristjan