strange behaviour rolling 12 months cummulated numbers

[TomThys]

I'm facing a rather strange problem wich i'm unable to find a solution for.

i have a 

Diagram that compares rolling 12month sales for the last 3 years.

when i plot this on the month based on the month number it is showing nicely.

But when i want to put the same date in a matrix but without the use of the month's i'm getting cummulated numbers:

is there anybody that can get me in the correct direction to find out what is going on.

I know when i put a date in the rows as first the output is correct but i do not want a date in the column.
just to clarify YTD = Rolling12months in this report and is build like:

YTD 2023 = 
VAR _EndDate = TODAY()
VAR _StartDate = EDATE(_yesterday, -12)
RETURN

CALCULATE( [Totale sales INV],  'Boekjaar INV'[Date]>=_StartDate && 'Boekjaar INV'[Date] <= _EndDate)

[parry2k]

@TomThys 

As a best practice, when you are working with dates, add a date dimension in your model and use it for time intelligence calculations. Once the date dimension is added, mark it as a date table on table tools. Check the related videos on my YT channel

Add Date Dimension
Importance of Date Dimension
Mark date dimension as a date table - why and how?
Time Intelligence Playlist

What do you expect the output to be in the matrix visual? Do you think the line visual is working as expected?