DAX changing its value

Hi, I'm working on a report where I have to show quarterly data based upon one or multiple years selected from the filter. I want to store the smallest year value for which i have created a measure shared below. Lets say I select year 2024,2025 and 2026 from filter. Now I should get cumulative sum of each quarter with its previous year. If I hardcode year in my dax then it works fine otherwise it cumulate sum for each years individually which I dont want. below are the measures and screenshot of line chart with hardcode value and with measure's value.

(Measure to get smallest year)

(Main Measure)

Cumulative Measure Sum =

var min_year = [MinYearSelected]

RETURN

CALCULATE(

    [udp high total fcst],

    FILTER(

        ALLSELECTED('DIM_DATE'[WEEK_END_DATE]),

        AND(

            ISONORAFTER('DIM_DATE'[WEEK_END_DATE], MAX('DIM_DATE'[WEEK_END_DATE]), DESC),

            YEAR('DIM_DATE'[WEEK_END_DATE]) >= min_year

        )

    ))

(Result I want using variable having smallest year value)

 

(Result I am getting using variable having smallest year value)