Why is this cron entry executed twice?

Question

*/5 * * * * my command

This entry works but every 5 minutes it gets executed twice, why?

In /var/log/cron it shows:

Answer 1

I had the same problem once, in my case was that I initialize the cron service twice by mistake. After I stopped cron # /etc/init.d/crond stop and started it again # /etc/init.d/crond start, it worked perfectly.

I hope this can help anybody.