calc a rolling rate

Here I am trying to calc a rate that measures soccer player efficiency.   I simple measure to compare players. 

like this  ( goals + ( assists * .5) ) *60 / minutes played.   This mirrors the formula in my real data set. 

Lets go through testGoalAssist  the dashboard.  

Page 1:   contains monthly measures  taking into account the slicers.  All good here

Rolling I:  created measures the accumulate over the months 

               As currently set,  accumulate the goals , assists and minutes played for Mar 2022 - June 2022.

               This works.   Viz in the lower left contains the correct results.  All good here.

Next I want to roll the efficiency measure over the months like this:

  ( sum goals over the months + ( sum assists over the months * .5) ) *60 

      divided by

         sum minutes played over the months

Rolling II:  looking at the viz Top center  

    effectiveRateOverPeriods A : returns the expected results .  

    effectiveRateOverPeriods: is wrong.   Not returning what I expect.

            do not understand what it is doing.  Not the returning my formula above.

Refering to the spreadsheet:  goals_assists_mar_june  at the top you can find 

    a spreadsheet showing what I expect

There are links to to G Drive below.

I cannot explain what is going on here.   It is beyod me.

Many thanks for your assistance.

KD