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Sorry to hear you’re facing problems 
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Nextcloud version (eg, 18.0.2):
Operating system and version (eg, Ubuntu 20.04):
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1):
The issue you are facing: When folders are shared to me, they usually appear in my Files overview as new folders. When re-sharing is allowed and somebody shares subfolders from an already shared folder, then this subfolder appears for me at top level. For me this feels like the data appears a second time. If this is by design, I would recommend to reconsider it as it would be easy to figure out that this folder is already shared. If not, I would recommend to fix it.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Share a folder to somebody
- Share a subfolder to the same person
- Check the file list of this person. You will see the main folder and the subfolder both on top level.
The output of your Nextcloud log in Admin > Logging:
I am just a user, not admin
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
I am just a user, not admin
The output of your Apache/nginx/system log in /var/log/____:
I am just a user, not admin