Get budget group by project with aggregate budget and task dax

I am working in a project with power BI and DAX but it seems not working right for me.

I have a first table vproject that contains multiple projects and each one have multiple tasks with multiple levels and I want to get each task the amount cost.

My measures work like the summarize of each level cost equal the sum of the budget. But when I want to aggregate the name of the task the budget doesn't summarize correctly. In this pic a demonstration of my input and my output :

projet| tache niv1| budget tache niv1|  tache niv2| budget tache niv2|  tache niv3|  budget tache niv3|     budget total
:1| a|      50|         b|      25|         c|       25|                300 $: 
:1| a|      50|         a|      50:          |         |:
:1| a|      30|         a|      20|         a|       50|:       
:2| a|      20|         x|      65|         y|       15|                200 $ :
:2| g|      15|         g|      25|         g|       60|    :   

And here are my measures and my query:

Budget_niv1= [Budget prévu ]*SELECTEDVALUE(vProject[PourcentageRépartitionniveau1])
Budget_niv2= [Budget prévu ]*SELECTEDVALUE(vProject[PourcentageRépartitionniveau2])
Budget_niv3= [Budget prévu ]*SELECTEDVALUE(vProject[PourcentageRépartitionniveau3])

Query for the new table :

Budget level = 
var Year = SELECTEDVALUE(vTime[fYear])
VAR CombineTable =
UNION(
        SELECTCOLUMNS(vProject, "niveau", vProject[Répartitionniveau1], "Budget", [Budget_niv1]),
        SELECTCOLUMNS(vProject, "niveau", vProject[Répartitionniveau2], "Budget", [Budget_niv2]),
        SELECTCOLUMNS(vProject, "niveau", vProject[Répartitionniveau3], "Budget", [Budget_niv3])
    )
VAR Resultat = 
    SUMMARIZE(
        CombineTable,
        [niveau],
        "Budget Total", 
    SUMX(
        FILTER(CombineTable, [niveau] = EARLIER([niveau])),
        [Budget]))
   
RETURN
Resultat