The following are the three queries and their respective results that I tried Against Adventure Works cube in Adventure Works DW SSAS database

Query 1:
Select [Measures].[Internet Sales Amount] on 0,
TOPCOUNT([Product].[Product Categories].[SubCategory].Members, 5,
([Customer].[Customer Geography].[Country].&[United States],[Measures].[Internet Sales Amount])) on 1
from [Adventure Works]

Query 1 Results:
Internet Sales Amount
Road Bikes - $14,520,584.04
Mountain Bikes - $9,952,759.56
Touring Bikes - $3,844,801.05
Tires and Tubes - $245,529.32
Helmets - $225,335.60

Query 2:
Select [Measures].[Internet Sales Amount] on 0,
TOPCOUNT([Product].[Product Categories].[SubCategory].Members, 5, [Measures].[Internet Sales Amount]) on 1
from [Adventure Works]
WHERE [Customer].[Customer Geography].[Country].&[United States]

Query 2 Results:
Internet Sales Amount
Road Bikes - $4,289,925.90
Mountain Bikes - $3,417,457.74
Touring Bikes - $1,292,475.90
Tires and Tubes - $88,769.73
Helmets - $76,768.06


Query 3:
Select ([Measures].[Internet Sales Amount], [Customer].[Customer Geography].[Country].&[United States]) on 0,
TOPCOUNT([Product].[Product Categories].[SubCategory].Members, 5,
([Customer].[Customer Geography].[Country].&[United States],[Measures].[Internet Sales Amount])) on 1
from [Adventure Works]

Query 3 Results:
Internet Sales Amount
Road Bikes - $4,289,925.90
Mountain Bikes - $3,417,457.74
Touring Bikes - $1,292,475.90
Tires and Tubes - $88,769.73
Helmets - $76,768.06

Query 2 and Query 3 return the correct results that I want (Top 5 Internet Sales Amount for [Product SubCategory members in US) .
But Query 1 gets me the top 5 total of [Product].[Product Categories].[SubCategory].Members despite the presence of the tuple ([Customer].[Customer Geography].[Country].&[United States],[Measures].[Internet Sales Amount])
Why is this happening. Any help is appreciated.