in.ftpd lists only directories, not files, for a particular user

A wordpress folder and all its subfolders are owned by ftpCustomer.

when ftpCustomer connects via FTP, the wp-content/uploads folder shows only subfolders and files with the S bit in their permission.

200 PORT command successful.
150 Opening ASCII mode data connection for '/bin/ls'.
total 672
drwxrwsr-x   4 ftpCustomer www-data   4096 Nov  2  2014 1
drwxrwsr-x   5 ftpCustomer www-data   4096 Oct  4  2014 2012
drwxrwsr-x   3 ftpCustomer www-data   4096 Aug 22  2014 2013
drwxrwsr-x  14 ftpCustomer www-data   4096 Nov 24  2014 2014
drwxrwsr-x  14 ftpCustomer www-data   4096 Dec  1  2015 2015
drwxrwsr-x   9 www-data www-data   4096 Jul 14 20:39 2016
-rw-r-Sr--   1 ftpCustomer www-data    375 Feb 22  2015 _input_1_test.php.
-rw-r-Sr--   1 ftpCustomer www-data    375 Feb 22  2015 _input_1_test.php.f8d1f9.bak
-rw-r-Sr--   1 ftpCustomer www-data    375 Feb 22  2015 _input_1_test.php5.bd77aa.bak
drwxrwsr-x  28 ftpCustomer www-data   4096 Jan 16  2015 avatars
drwxr-sr-x   2 ftpCustomer www-data   4096 Aug 22  2014 backupbuddy_backups

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Connecting via ssh, I find hundreds of files.  Even via FTP, I find hundreds of files if I connect as a different user.

What would be wrong with the ftpCustomer login so that FTP would return partial results?

Thanks!