Cron jobs repeating

I've got a couple of cron jobs set up to run on a daily basis at a specific time. For instance, one runs every day M-F @ 2:50pm to send some lead data to about 600 subscribers via email. Today the thing ran 5 separate times - at 2:40pm, 2:50pm, 2:53pm, 2:55pm, and 3:01pm.

This has also happened quite a few times with another cron job that is set up for me to retrieve data from a remote FTP location. It may retrieve the same stuff 3 or 4 times.

What causes this to happen? Is it a problem in the cron program? Is there something I need to do in the cron set up to avoid these problems?
 
This is linux cron or a cf schedule(I think you may have had one or two of them)
 
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