Why am I getting large log files full of blanks

From: Bob (rpl@goldengate.net)
Date: 07/06/02


From: "Bob" <rpl@goldengate.net>
Date: Fri, 5 Jul 2002 18:55:13 -0500


I am getting large log files ( 64k) from my web site and from my ftp server.
The log files contain 1 k of test and 63k of blank spaces.

How can I tell if someone is deleting text from the log files ?

TIA
bob