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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version : 18.0.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu Server 18.04LTS
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.1): 7.4
The issue you are facing: After running a files:scan, there are multiple folders missing under our shared group folders (40GB or so).
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Log in
- Try to access data
- Data only shows 25GB when it should be 65GB
The output of your Nextcloud log in Admin > Logging: There are no instances of DELETE or MOVE that would account for this loss.
PASTE HERE
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oczcsoczpog8',
'passwordsalt' => 'eHDoTO5Nxyyuf1ho87p2E3nxkGsZq/',
'secret' => 'yCrjXVn+PjucExeag/zu/RVtC1dMxF4V6HOBakpHXtGhu2Ek',
'trusted_domains' =>
array (
0 => 'nextcloud',
),
'datadirectory' => '/dev/sdb1/nextcloudfiles/',
'dbtype' => 'mysql',
'version' => '18.0.2.2',
'overwrite.cli.url' => 'https://',
'dbname' => 'nextcloud_db',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'ncadmin',
'dbpassword' => '',
'installed' => true,
'theme' => '',
'loglevel' => 2,
'maintenance' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'mail_smtpmode' => 'smtp',
'mail_smtpsecure' => 'tls',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'nextcloud',
'mail_domain' => '.com',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtphost' => 'smtp.office365.com',
'mail_smtpport' => '587',
'mail_smtpname' => 'nextcloud.com',
'mail_smtppassword' => '',
);
The output of your Apache/nginx/system log in /var/log/____:
PASTE HERE