Non additive measure - advanced weighted average

In the end I fix the problem it was all coming from diff calculation. So I had to split the diff calculation like below

VAR hedge_volume = 
        SUMX(
            FILTER(DealGroupPWR, NOT DealGroupPWR[StrategyID] IN {1, 2, 3}),
            DealGroupPWR[GROUP_TotalVolumeMW])
VAR real_generation = 
        SUMX(
            FILTER(DealGroupPWR, DealGroupPWR[StrategyID] IN {1, 2, 3}),
            DealGroupPWR[GenerationHedgeVolume])

VAR diff = 
        IF(real_generation = 0, 0, real_generation - hedge_volume)
RETURN
    IF(HASONEVALUE('delivery date'[date]), diff, 
        SUMX(
            VALUES('delivery date'[date]),
            IF(
                CALCULATE(SUMX(FILTER(DealGroupPWR, DealGroupPWR[StrategyID] IN {1, 2, 3}), DealGroupPWR[GenerationHedgeVolume])) = 0,
                0, 
                -- real generation condition
                CALCULATE(SUMX(FILTER(DealGroupPWR, DealGroupPWR[StrategyID] IN {1, 2, 3}), DealGroupPWR[GenerationHedgeVolume])) - 
                -- real generation volume
                CALCULATE(SUMX(FILTER(DealGroupPWR, NOT DealGroupPWR[StrategyID] IN {1, 2, 3}), DealGroupPWR[GROUP_TotalVolumeMW]))
            )   -- hedge volume
        )
    )