Wrong total shown in PBI using SUMX

I have this measure in PBI:

KPI logeffact =
var ALTN =
CALCULATE(
sum('PrinTable'[KPI1]),
'PrinTable'[DataType] = "F",
'PrinTable'[CheckFlag] = "Y"
)

var AltDelta =
CALCULATE(
sum('PrinTable'[KPI2]),
'PrinTable'[CheckFlag] = "Y"
)

var logeff =
VAR ThisMonMth = MAX('Date Table'[YearMonth])
RETURN
CALCULATE(
(sum('PrinTable'[KPI3]) - sum('PrinTable'[KPI4])) ,
FILTER(
'PrinTable',
'PrinTable'[CheckFlag] = "Y"
&&
'PrinTable'[YearMonth] <= ThisMonMth
)
)
+ CALCULATE(
sum('PrinTable'[KPI5]),
'PrinTable'[DataType]="F",
'PrinTable'[CheckFlag] = "Y",
'PrinTable'[YearMonth] > ThisMonMth
)

VAR _monthOfAnalysis = SELECTEDVALUE ( 'Date Table'[YearMonth] )

VAR firstMonthOfAnalysis =
INT ( LEFT ( _monthOfAnalysis, 4 ) & "01" )
VAR rifemval =
IF (
NOT ISBLANK( _monthOfAnalysis),
CALCULATE (
SUM ( 'PrinTable'[Rif EM Value] ),
FILTER (
'PrinTable',
'PrinTable'[YearMonth] >= firstMonthOfAnalysis &&
'PrinTable'[YearMonth] <= _monthOfAnalysis
)
)
)

return
IF(rifemval=BLANK(), ALTN+ logeff,AltDelta+logeff)

1. VAR _monthOfAnalysis = SELECTEDVALUE ( 'Date Table'[YearMonth] ) is a slicer from a table detached from the data model. 
2. the KPI is correct month by month. the month dimension comes from PrinTable --> YearMonth which values are formatted as "202503", "202504" and so on. 
3. the total is wrong. 

the total sum should be: 

for each month I have the following values:

but the total shown in PBI is -616.78609

I'm actuallt trying to replicate a BO KPI which uses exactly the same logic of my PBI measure but what it does is a 
=Sum([KPI with the same logic and results as PBI]  ForEach([year / month]) ) 
and when seen in BO the total actually is 657,528
1. year / month is my 'PrinTable'[YearMonth] as explained above, and it's formatted in the same way (202503,202504,...,ecc)

2. in BO _monthOfAnalysis  is a user prompt, but the behaviour is the same that is in action in PBI

This KPI in BO, like in my PBI tablix, is used with a dimension "Country" but not with any temporal dimension (nor yearmonth from PrinTable or _monthOfAnalysis)

this is what I did in PBI:

Please help me undertand how to retrieve the right total!

thank you!!