Email Statistics Conditions for Multiple Parent Campaign folders

Hello.
I recently received a response from Nation and with the help of an engineer at the support center.
I understood that the campaign folder only aggregates emails from smart campaigns inside the folder.

However, I have additional questions, so I'm asking you one more question.

What I would like to ask you additionally is that if there are multiple child campaign folders within one parent campaign folder, does the email statistics in the parent campaign folder aggregate emails from your own smart campaign and all the smart campaigns within the child campaign folder?
Assuming the answer to the above question is 'true', I checked my instance and it was not.

When I checked on my instance, The email data found in the child campaign folder(New Campaign Folder) is not visible in the parent campaign folder(Jiwon Heo folder), but it is visible in the grand parent campaign folder(Marketing Internal Training folder).
Can you tell me why it is confirmed like this?
I attached a screenshot with each folder name, so please check it.

- Campaign hierarchy : Marketing Internal Training > Jiwon Heo > New campaign folder

- grand parent campaign folder(Marketing Internal Training folder)

- parent campaign folder(Jiwon Heo folder)

- child campaign folder(New Campaign Folder) 

I'm desperate for help. Thank you.