glob_prop Calculation

Dears

I'm trying to understand the rolling average(glob_prop) calculation so I uploaded only one item/location combination as following

Item_ID	Location_ID	Sales_Date	Actual_Quantity
1	2	12/3/2018	40
1	2	11/19/2018	25
1	2	11/5/2018	75
1	2	10/29/2018	50
1	2	11/12/2018	30
1	2	11/26/2018	60
1	2	12/10/2018	50

• quantity_form = greatest (nvl(pseudo_sale,nvl(actual_quantity, src_actual_quantity))*(1 + nvl(demand_fact,0)),0)
• hist_glob_prop= 26
• Proport_missing = 0
• timeunit = 3 (Weekly)
• IS_FICTIVE =0
• Prediction_Status=1
• DO_AGGRI=1

As per my understanding, the glob_prop Calculation would be

If Proport_missing = 0 then 330/26

If Proport_missing = 1 then 330/7

actually, the  calculated glob_prop saved in the MDP_Matrix is 36.6666666666667. and i dont know how it was calculated

thanks in advance