10 minute time difference

I am running radium and writing to a file into a file location, /data/var/argus.out.  Every five minutes I
copy this file into a directory and rename the file to the current date and time.  While reading this file
with ra, it appears to be 10 minutes in the past.  For example, a file that is named
2010-01-18-10:25:00.argus contains data from 10:15-10:20.  Is there a reason why this would occur?  The
timestamps on the data source are synced with ntp as is the destination.

Thanks,

Jason