cron runs everything twice

[Obi]

I'm having a problem with cron: it runs all my commands twice. For example,
root's crontab looks like (the 2nd entry is for debugging):

0 4 * * * /etc/escher -m >/dev/null 2>&1
0,20,40 * * * * /bin/echo "Hi there" >/dev/null 2>&1

Here are a few lines from my /usr/lib/cron/log:
>  CMD: /etc/escher -m
>  root 2479 c Tue Oct  2 03:58:57 1990
<  root 2479 c Tue Oct  2 03:59:03 1990
>  CMD: /etc/escher -m
>  root 2491 c Tue Oct  2 04:00:00 1990
<  root 2491 c Tue Oct  2 04:00:05 1990
>  CMD: /bin/echo "Hi there" >/dev/null 2>&1
>  root 2726 c Tue Oct  2 12:39:57 1990
<  root 2726 c Tue Oct  2 12:39:57 1990
>  CMD: /bin/echo "Hi there" >/dev/null 2>&1
>  root 2728 c Tue Oct  2 12:40:00 1990
<  root 2728 c Tue Oct  2 12:40:01 1990

I've checked to make sure there's only one cron running.  Please help if you
have any clues.  Thanks.