Incorrect subtotals in matrix visual

I'm calculating the run rate for sales managers to project how many onboarded customers have placed an order on an ecom app at the end of a period. The start of period (Date_initialised) for each sales manager is different but the end of period is the same. The DAX measure per sales manager is correct, but it won't aggregate to higher hierarchical levels (I have multiple hierarchical levels e.g., suburbs, regions) in the matrix visual. My DAX is as below:

CurrentRunRate = 

VAR Last_update = MAX(Fact_Weekly[full_date])

VAR Date_initialised = SELECTVALUE(Fact_DateInitialised[Date Initialised])

VAR Days_gone = DATEDIFF(Date_initialised, Last_update, DAY)

VAR End_of_period = DATE(2023,11,2)

VAR Days_in_period = DATEDIFF(Date_initialised, End_of_period, DAY)

VAR Avg_per_day = 
IF(
    DATEDIFF(Last_update, End_of_period, DAY) > 0,
    DIVIDE(
        [Have Ordered],  /*<-- SUM(Dim_customer_detail[Have Ordered (1/0)])*/
        Days_gone
    )
)

Return
    Avg_per_day * Days_in_period

I later replaced 

VAR Date_initialised = SELECTVALUE(Fact_DateInitialised[Date Initialised])

with 

VAR Date_initialised = MAX(Fact_DateInitialised[Date Initialised])

Although there are values in the subtotals and totals, they are incorrect (snip below, all the blues are subtotals). For example, I want 90+100=190 not 198.