Slicer Select All Option not working as expected

Thankyou Anonymous  and PijushRoy  for your solution.

Anonymous had the correct understanding ,

Apologies for not able to explain the problem statement before but my requirement was as given below :
 

• End User wanted to get all the associated TEST IDs where a certain product has been involved by using the slicers 
• After above step, once we get the list of TEST IDs in the slicer, I should be able to see the TEST RESULTS in child page but the graph should contain all the products involved in the TEST ID

Example :
If I select Region = Asia ,
  && Product Name = PrdouctAsia then
I get all the associated TEST IDs where " Product Asia " is involved

Now If I select TEST ID = 101 and go to the child page, the expected output (for test ID - 101, there were total 2 products involved which should come) as given in the below snapshots :
 

Now for the above scenario, even if you click on SELECT ALL from TEST ID slicer, you will be receiving the output as shown below :

The solution has been achieved by implementing below steps :
 

• Creating new summarized table where I had all the combination present 
• creating many to many relationship between FACT Table and Summarized Table based on TEST ID column 
• Using the columns in the slicers from summarized table
• Synchronizing all the slicers from parent page to child page and hide it from selection pane
• the table visual in child page was coming from FACT Table

both the tables looks like below (unable to attach the PBIX files here) : 

FACT TABLE : 

SUMMARIZED TABLE : 

Thanks,
Ankita