Problem with cumulation total when adding filters

Hello,

I have the following table :

StockTable

I have created this measure to have the cumulative total of the Qty :

qty_cumul = 
CALCULATE(
	SUM(Stock[Qty]);
	FILTER(
		ALL(Stock[date]);
		Stock[date] <= MAX(Stock[date])
	)
) 

It works as I want. When I want to see the evolution of the cumulative total for specific entities (let's say ENT_1 and ENT_2), it still works well. 

HOWEVER i have a problem when I add a visual filter to see the evolution of the total for a specific period. The result is not the sum of the cumulative quantity of ENT_1 and ENT_2 (whereas it is when i don't use the filter on the date).



I realised this graph is displaying alternatively the cumulative total of ENT_1 and ENT_2 which is not what I want.

When I added the filter on the date i expected my bottom chart to be a "zoom in" of the top chart.

I don't understand why it doesn't work as I want. I feel like I am missing something.

Can you help me please.

I am working in DirectQuery mode but to explain my issue i created a custom table.

Here the file i used to do the screenshots:

https://www.dropbox.com/s/sekh8g8ht03ibbs/StockCumulativeTotal.pbix?dl=0