cron runs 1 hr not another

["John Fleming" <john@wa9als.com>]

Can someone tell me why cron runs the 0500 job and not the 1700 job
and/where to look for clues?  Thanks

root@Luke:/etc# crontab -l
# 7 * * * * sa-learn --mbox --spam /home/john/Spam
0 5,17 * * * perl /etc/mail/spamassassin/sa-stats.pl -u -s 'yesterday' -e
'now' --logfile=/var/log/mail.log
root@Luke:/etc#