Measure not calculating on broader context/level

I was able to resolve the issues by using the ALLEXCEPT with 2 columns/slicers. See the red highlighted lines. I used the allexcept in both the filter and in the actual calculation. For the calculation I wrapped it in a calculate so we can change the row context to use just the context of selecte dates and patient vs. the facility row context. 

var months = 
     AVERAGEX(
         //for each patient and programstart find the number of months enrolled. 
         SUMMARIZE( 'AllEncounters', 'AllEncounters'[Patient ID]),//,'AllEncounters'[Program Start Date],
           // "MonthsEnrolled",   
            //look only at records whose program dates are within the date range selected 
            //and they are enrolled at least 1 month. We don't want to include those with no enrollment in the averaging. 
          maxx(
              FILTER(allexcept('AllEncounters','AllEncounters'[Patient ID],'CalendarTable'[Date]),
                    'AllEncounters'[Program Start Date] <= 'AllEncounters'[1 DateEnd]  && 
                    'AllEncounters'[Program End Date] >= 'AllEncounters'[1 DateStart] &&
                     DATEDIFF('AllEncounters'[2 Program Start Date within Date Range], 
                         'AllEncounters'[2 Program End Date Within Date Range], month) > 0 
                 ), //end filter*/
              
             //find the number of months between enrollment dates
 calculate( DATEDIFF('AllEncounters'[2 Program Start Date within Date Range], 
 'AllEncounters'[2 Program End Date Within Date Range], month) ,allexcept('AllEncounters','AllEncounters'[Patient ID],'CalendarTable'[Date])))//end maxx 
 // ), //end outer summarize
 // [MonthsEnrolled] 
 )//get the average months enrolled
 

return if(months <> 0,months, blank())

 
Here is the correct result (10 is showing across the board regardless of the facility:

This also seems to have corrected the calculation error described in "issue 2".The % is calculating correctly. 

Hope this helps others in the future.