The Bot Defense has blocked some spam and recorded the ip's. If the submission bot keeps coming back maybe is best for you to block the specific ip.

To block ip addresses follow this steps:
1) Edit your .htaccess file; if you're using Cpanel and can't see it in your root directory mark "show hidden files" when the file manager asks what is your desired directory.
2) To block an ip add this:
order allow,deny
#block one ip address
deny from x.x.x.x
#block a range of addresses (note the last digits are missing)
deny from x.x.x
allow from all