multiple ntpd processes

[Nerius Landys]

I'm running FreeBSD 7.0, and I have 'ntpd_enable="YES"' in my /etc/rc.conf.
Every time I reboot my server, I get two ntpd processes:

nlandys at daffy# ps -U root | grep ntpd
  PID  TT  STAT      TIME COMMAND
  571  ??  Ss     0:00.12 /usr/sbin/ntpd -c /etc/ntp.conf -p
/var/run/ntpd.pid
  686  ??  S      0:00.00 /usr/sbin/ntpd -c /etc/ntp.conf -p
/var/run/ntpd.pid

When I run '/etc/rc.d/ntpd stop' it kills the first process in the output
above but leaves the second one.  I must manually kill this second process
and then run '/etc/rc.d/ntpd start' to get ntpd to function normally,
otherwise [while there are 2 processes running] ntpd does not seem to keep
the clock in sync.  Please help.