Hierarchical Ranking Positive to Negative values

Anonymous Sample data please. Sorry, having trouble following, can you post sample data as text and expected output?
Not really enough information to go on, please first check if your issue is a common issue listed here: https://community.powerbi.com/t5/Community-Blog/Before-You-Post-Read-This/ba-p/1116882

Also, please see this post regarding How to Get Your Question Answered Quickly: https://community.powerbi.com/t5/Community-Blog/How-to-Get-Your-Question-Answered-Quickly/ba-p/38490

The most important parts are:
1. Sample data as text, use the table tool in the editing bar
2. Expected output from sample data
3. Explanation in words of how to get from 1. to 2.

Sorry for not posting a sample dataset before. 

Here is a sample data for Locations and Income tables; 
Location Table:

Income table:

both Locations and Income tables joined by Store_Number. 

Here are images for what is expected; 

Expanded matrix: 

Collapsed matrix:

Instead, I'm getting this in Power BI: 

I don't understand why the transition from positive to negative 'Operating Income' generates a blank row in the matrix and assignes it a rank = 2.

Dax used to create the measure 'Op Income Rank': 

Op Income Rank = 
var rank_region =
RANKX(
     ALL('Location'[Region]),
      [Operating Income], , DESC
      )
var rank_store = 
RANKX(
    FILTER(
        ALL('Location'[Store Name], 'Location'[Region]),
         'Location'[Region] = MAX('Location'[Region])
         ), [Operating Income], , DESC
    )
return
    SWITCH(TRUE(),
        ISINSCOPE('Location'[Store Name]), rank_store,
        ISINSCOPE('Location'[Region]), rank_region,
            BLANK() )

Measure 'Operating Income' was previously calculated, it doesn't present any issue. 

I have researched this issue in the web, but no body had this problem before. I may be doing something wrong, but I can not see what is it. 

Thanks in advance!