Users quota does't work correctly

Nextcloud version (13.0.4) :
Operating system and version (Ubuntu 18.04) :
Apache version (Apache 2.4.29) :
PHP version (7.1.18) :

The output of `/var/www/html/nextcloud/config/config.php` :
$CONFIG = array (
  'instanceid' => 'xx',
  'passwordsalt' => 'xx',
  'secret' => 'xx',
  'trusted_domains' => 
  array (
    0 => '',
  'datadirectory' => '/var/www/html/nextcloud/data',
  'overwrite.cli.url' => '',
  'dbtype' => 'mysql',
  'version' => '',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'xx',
  'dbpassword' => 'xx',
  'installed' => true,
The output of `/etc/apache2/sites-available/nextcloud.conf` :
<VirtualHost *:80>
     DocumentRoot /var/www/html/nextcloud/

     Alias /nextcloud "/var/www/html/nextcloud/"

     <Directory /var/www/html/nextcloud/>
        Options +FollowSymlinks
        AllowOverride All
        Require all granted
          <IfModule mod_dav.c>
            Dav off
        SetEnv HOME /var/www/html/nextcloud
        SetEnv HTTP_HOME /var/www/html/nextcloud

     ErrorLog ${APACHE_LOG_DIR}/error.log
     CustomLog ${APACHE_LOG_DIR}/access.log combined


The output of your Nextcloud log in Admin > Logging:

The issue:
Quota does not work correctly.

  1. Create user in Nextcloud and give him 10mb quota
  2. Add this user to Nexcloud client app and add some big folder (more than 10mb). I added 3.8GB folder.
  3. The in NC client synchronization will be successful
  4. Go to NC interface, you will see files which is less than 10mb
  5. Go to your server when NC is installed and open users folder. You will see all this 3.8GB. You can use ncdu command

So all this 10mb quota is nothing :frowning:

I have another instance with Nextcloud and issue is the same.

Please, fix it.