RANKX returning duplicate values

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Thank you for the reply, Ahmedx.

I solved the issue in the following way:

First, I changed the data type for the Unit price from decimal number to whole number (in Power Query Editor).
I use Unit price to calculate the Total Sales:

Total Sales =

SUMX(

    FactSales,

    FactSales[Order Quantity] * FactSales[Unit Price]

)

 

Next, I used the below formula to calculate the ranking:

Rank Sales (disregarding hierarchy) =

IF(

    ISINSCOPE(DimTerritory[Region]),

    RANKX(

        ALLSELECTED(DimTerritory),

        [Total Sales]

    ),

    IF(

       ISINSCOPE(DimTerritory[Continent]),

    RANKX(

        ALLSELECTED(DimTerritory[Continent]),

        [Total Sales]

    )

    )

)

 

As a result, I obtain the correct result:

 

 

The only confusion left is why I had to change the data type from decimal to whole number for this to work.
But for now the issue is solved.