gtm keeps making 'sh <defunct>' processes

[Ray <ray.list@powerweb.net>]

i'm not sure if its just a setting i have wrong, but when i've finished 
downloading stuff there are a number of sh <defunct> show up in ps -A

part of the output from 'ps -AH'

  PID TTY          TIME CMD
21152 ?        00:00:00   gtm
21159 ?        00:00:00     sh <defunct>
21162 ?        00:00:00     sh <defunct>
21165 ?        00:00:00     sh <defunct>
21168 ?        00:00:00     sh <defunct>
21171 ?        00:00:00     sh <defunct>
21174 ?        00:00:00     sh <defunct>
21177 ?        00:00:00     sh <defunct>
21181 ?        00:00:00     sh <defunct>
21186 ?        00:00:00     sh <defunct>
21189 ?        00:00:00     sh <defunct>
21192 ?        00:00:00     sh <defunct>
21195 ?        00:00:00     sh <defunct>

what setting did i foobar or is it a bug? i didn't find it in the bug list 
for gtm on debian or sourceforge.

gtm 0.4.11-4
wget 1.8.1-6.1