Paginated Report Issue

Hi,

we are creating a paginated report
Data Source is SSAS Tabular
We have created measures in ssas

this is the format of report created
(hierarchy wise - expand and collapse)

                                                          2020
                                                           jan                                                  Feb
Department         Category        Week1 Week2 Week3               Week 1 Week2 Week3
Drinks                        abc                 10    20       30                        11        22       33

Have done the grouping and visibility set accordingly

When I just select year and month and do the grouping - the values come correct

But when i add week column - the monthwise total is not the addition of all weeks , it randomly picks up any one week value

Any suggestions pls