Measure result differs based on order applied onto visual

Hi All,

I have a wierd problem: the result of two measures depend on the order they are applied onto a Matrix visual. Could this be a storage engine bug? If I change the order of the measure after they were applied onto the visual, nothing happens. I have to delete one measure and apply back again for the changes to take effect.

Here are my tables:

Here's the first result:

And here's the second one:

And heres' my DAX:

Article Motive Count =
COUNTROWS ( article_motives )

Aftersales Motives = 
    VAR PackageSelection2 = {"P6 - Backpack"} --,"P2 - Subpart","P6 - Backpack","P9 - Shoe","P10 - Accessory"}
    VAR RelevantPackages2 =
        CALCULATETABLE(
            article_packages,
            packages[name] IN PackageSelection2
        )
    VAR RelevantMotives2 =
        CALCULATETABLE(
            VALUES( package_motives[motive_id] ),
            RelevantPackages2
        )
    VAR MotivesNeeded2 =
        CALCULATE(
            [Article Motive Count],
            TREATAS( RelevantMotives2, article_motives[motive_id])
        )
    RETURN
        MotivesNeeded2

Pre-sales Motives = 
    VAR PackageSelection = {"P1 - Toppart","P2 - Subpart","P6 - Backpack","P9 - Shoe","P10 - Accessory"}
    VAR RelevantPackages =
        CALCULATETABLE(
            article_packages,
            packages[name] IN PackageSelection
        )
    VAR RelevantMotives =
        CALCULATETABLE(
            VALUES( package_motives[motive_id] ),
            RelevantPackages
        )
    VAR MotivesNeeded =
        CALCULATE(
            [Article Motive Count],
            TREATAS( RelevantMotives, article_motives[motive_id])
        )
    RETURN
        MotivesNeeded