MoM

MoM = 
VAR __BASELINE_VALUE = [Last Month AVG Net]
VAR __VALUE_TO_COMPARE = [Net USD AVG]
VAR __CONDITION =
    SWITCH (
        TRUE (),
        NOT ISBLANK ( __VALUE_TO_COMPARE ),
            FORMAT (
                DIVIDE ( __VALUE_TO_COMPARE - __BASELINE_VALUE, __BASELINE_VALUE, 0 ),
                "0.0%"
            )
    )
VAR __CONDITION_UNFORMATTED =
    SWITCH (
        TRUE (),
        NOT ISBLANK ( __VALUE_TO_COMPARE ),
        DIVIDE ( __VALUE_TO_COMPARE - __BASELINE_VALUE, __BASELINE_VALUE, 0 )
    )
RETURN
    SWITCH (
        TRUE (),
        VALUE ( __CONDITION_UNFORMATTED ) >= 0, CONCATENATE ( __CONDITION, CONCATENATE ( " ", UNICHAR ( 9650 ) ) ),
        CONCATENATE ( __CONDITION, CONCATENATE ( " ", UNICHAR ( 128315 ) ) )
    )

with this measure I get the correct classification, it has to be something in your data.

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