RANKX not functioning properly

Hey everyone

I have an interesting situation. 

I have a list of customers with sales. I want to rank them by sales and make a comparison between the first X by sales and the rest of the customers. 
Here is the Table with the three measures (Rank_Kunde, Rank_Kunde2, Rank_Kunde4)

As you can see, the sorting is really wierd. Skipping some numbers and at the same time sorting incorrectly.

Rank_Kunde = 
VAR _kunde =  SELECTEDVALUE(Table[Kunde_])
VAR _sum = CALCULATE(SUM(Table[Nettoerlös]),FILTER(ALLSELECTED(Table),Table[Kunde_]=_kunde))
RETURN _sum

Rank_Kunde2 = RANKX(ALLSELECTED(Table), CALCULATE([Rank_Kunde]),,DESC,Dense)

Measure 3 (Rank_Kunde4) is quite long, and irrelevant, but ill post in anyway:

Rank_Kunde4 = 
VAR _top =  SELECTEDVALUE(TOPX[Top])
VAR _first = RANKX(ALLSELECTED(KE30_KPI), CALCULATE([Rank_Kunde]),,DESC,Dense)
VAR _kunde = SELECTEDVALUE(KE30_KPI[Kunde_])
VAR _one = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 1))
VAR _two = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 2))
VAR _three = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 3))
VAR _four = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 4))
VAR _five = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 5))
VAR _six = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 6))
VAR _seven = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 7))
VAR _eight = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 8))
VAR _nine = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 9))
VAR _ten = CALCULATE(FIRSTNONBLANK(TOPKunden[Kunde_],1),FILTER(ALL(TOPKunden),TOPKunden[Rank] = 10))

VAR _result10 = SWITCH(_first, 1, _one, 2, _two, 3, _three, 4, _four, 5, _five, 6, _six, 7, _seven, 8, _eight, 9, _nine, 10, _ten, "Übrige Kunden")
VAR _result9 = SWITCH(_first, 1, _one, 2, _two, 3, _three, 4, _four, 5, _five, 6, _six, 7, _seven, 8, _eight, 9, _nine, "Übrige Kunden")
VAR _result8 = SWITCH(_first, 1, _one, 2, _two, 3, _three, 4, _four, 5, _five, 6, _six, 7, _seven, 8, _eight, "Übrige Kunden")
VAR _result7 = SWITCH(_first, 1, _one, 2, _two, 3, _three, 4, _four, 5, _five, 6, _six, 7, _seven, "Übrige Kunden")
VAR _result6 = SWITCH(_first, 1, _one, 2, _two, 3, _three, 4, _four, 5, _five, 6, _six, "Übrige Kunden")
VAR _result5 = SWITCH(_first, 1, _one, 2, _two, 3, _three, 4, _four, 5, _five, "Übrige Kunden")
VAR _result4 = SWITCH(_first, 1, _one, 2, _two, 3, _three, 4, _four, "Übrige Kunden")
VAR _result3 = SWITCH(_first, 1, _one, 2, _two, 3, _three, "Übrige Kunden")
VAR _result2 = SWITCH(_first, 1, _one, 2, _two, "Übrige Kunden")
VAR _result1 = SWITCH(_first, 1, _one, "Übrige Kunden")
VAR _topXResult = SWITCH(_top, 1, _result1, 2, _result2, 3, _result3, 4, _result4, 5, _result5, 6, _result6, 7, _result7, 8, _result8, 9, _result9, 10, _result10)
RETURN _topXResult<span><br />Could anyone explain why my RANKX is not working?<br /><div> <div><span>Thank you<div><span>Daniel</span></div></span></div></div></span>

Does anyone know where I might have made a mistake or why RANKX is not functioning?

Thank you

Daniel