Data Label to show percentage difference between two columns

Hi AMitchell Could you check this please 

• Create a Measure for Percentage Difference: 

  Percentage Difference = DIVIDE( [February Value] - [January Value], [January Value], 0 ) * 100

• Add the Measure as a Data Label:

  • Select your visual.
  • Drag the Percentage Difference measure into the "Values" field of the chart
    If this post helped please do give a kudos and accept this as a solution
    Thanks In Advance

My measure has to be fluid as the dates change:

Say Value Change (Fund) =

VAR LatestDate =

    CALCULATE(

        MAX(PropData[Valn Date])

    )

VAR PreviousDate =

    CALCULATE(

        MIN(PropData[Valn Date])

    )

VAR LatestValue =

    CALCULATE(

        SUM(PropData[Say Value]),

        PropData[Valn Date] = LatestDate

    )

VAR PreviousValue =

    CALCULATE(

        SUM(PropData[Say Value]),

        PropData[Valn Date] = PreviousDate

    )

RETURN

    IF(

        NOT(ISBLANK(LatestValue)) && NOT(ISBLANK(PreviousValue)),

        (LatestValue - PreviousValue) / PreviousValue,

        BLANK()

    )

 

If i add this to the chart i get this:

 The format of the measure is set to percentage and when i show it in a card it's working:

 

It's a Bug.. a lot of users have the same Problem.. 
In my case looks like this: 

Workaround for the moment: Create Labels with FORMAT Strings and use them as Label..

It's a joke to be honest.. 
With the January update was the same problem after uploading it. In Desktop no Problem at all but after publishing the formating disappeared.