Manage shared folders

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I have a folder shared with a group and some of users have the client and have local mirors.
An error happends tha make the folder duplicate itself in islelf
In other words I shoul have :
/shared_folder/sub_folder(s)
And I get
/shared_folder/subfolder and /shared_folder/shared_folder/subfolder(s)
The space used had doubled and there is risk of confusion.

I suppose there had a misconfiguration in one of my user’s client.
It the second time it happends (al alweady had clean up the same thing)
I will check that with them.

I alweady make misconfigurations mysel using the wisard.
I relay prefer to do it by hand after install, it is much more clear.

Is there a way to secure the folders hierarchy from users errors and still authorise people to create and modify files , but not create or delete folders ?

Thanks

Nextcloud version (eg, 12.0.2):
Operating system and version (eg, Ubuntu 17.04):
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1):

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N):

Steps to replicate it:

The output of your Nextcloud log in Admin > Logging:

PASTE HERE

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

PASTE HERE

The output of your Apache/nginx/system log in /var/log/____:

PASTE HERE