Nicelevel override

[koper89]

Hi,
I have a problem with configuration of rtorrent nicelevel

Terminal

start-stop-daemon --start --nicelevel 6 --background --pidfile $PID_FILE --exec /usr/bin/dtach -- -n $TMP rtorrent -n -o import=$CONF

This is my configuration and at the start it seems ok i checked it in top, but after some time it gets override by nicelevel 11 what can be a cause of this?