My best guesses are:

1. $upload_dir doesn't contain what you think it contains.

   If $email_address is empty, something that your script as posted did not verify, then you would be performing the File::Find on the parent subdirectory.

   As File::Find processes the entire sundirectory tree starting at the subdir you give it, this would cause it to accumulate the filesizes of all the files in all the subdirectories below /home/bsexton/public_html/NEWClients/. You could verify this speculation by manually issuing an ls or du or whatever command on that directory and it's children and see if the number matches.

2. The subdir you are checking itself contains other subdirs (or possibly symbolic links) and they are being included in the search by File::Find.

These are just guesses. You are the only one who can eliminate them as possibilities and if they are incorrect, you will need to try a little lateral thinking of your own.