Grouping or bin level sort is not working using switch DAX

Im trying to migrate existing tableau range selection to PBI. Over all total value matches but group by (condtional sorting) is not  not working as expected.

I have a transaction table for retail mart. Discount and Gallons are direct measures and Transaction id is row level data with multiple records for same transaction ids.

Step1:
Discount Per Gallon =

{FIXED [Transaction Id]: avg(([Discount]))/avg(([Gallons])) }

Step2:

Discount Per Gallon Range =

IF ([Discount Per Gallon]) >= 0 AND ([Discount Per Gallon]) <= .05 THEN "0.0 - 0.5" ELSEIF
([Discount Per Gallon]) > .05 AND ([Discount Per Gallon]) <= .10 THEN ".5 - .10" ELSEIF
([Discount Per Gallon]) > .10 AND ([Discount Per Gallon]) <= .15 THEN ".10 - .15" ELSEIF
([Discount Per Gallon]) > .15 AND ([Discount Per Gallon]) <= .20 THEN ".15 - .20" ELSEIF
([Discount Per Gallon]) > .20 AND ([Discount Per Gallon]) <= .25 THEN ".20 - .25" ELSEIF
([Discount Per Gallon]) > .25 THEN "> .25" END

Same is achieved in Power bi using below calculations: 

Average of Discount Per Gallons = CALCULATE(AVERAGE(RETAIL_MART[Discount Per Gallon]), ALLEXCEPT(RETAIL_MART,RETAIL_MART[TRANSACTION_ID]))

Here, Discount Per Gallon = calcuated column of ( Discount/Gallons) at transform layer.

Groupie =
VAR DiscountPerGallon = [Average of Discount Per Gallons]
RETURN
SWITCH(
TRUE(),
DiscountPerGallon >=0 && DiscountPerGallon <= 0.05 , "0.0 - 0.05",
DiscountPerGallon > 0.05 && DiscountPerGallon <= 0.10 , "0.05 - 0.10",
DiscountPerGallon > 0.10 && DiscountPerGallon <= 0.15 , "0.10 - 0.15",
DiscountPerGallon > 0.15 && DiscountPerGallon <= 0.20 , "0.15 - 0.20",
DiscountPerGallon > 0.20 && DiscountPerGallon <= 0.25 , "0.20 - 0.25",
DiscountPerGallon > 0.25, ">0.25",
"NULL"
)

But the calcualted result looks different . Expected ResultActual Result