Awstats traffic versus Ispcp traffic

[kvaes]

We've got an odd problem where the stats reported in by awstats on traffic differ a lot from the stats reported withing ispcp.

domain X (factor 6)
awstats says 325MB bandwidth
ispcp says 2.10GB

domain Y (factor 4)
awstats says 1.54 GB bandwidth
ispcp says 6.78GB

I've checked my crontab, and everything is setup correctly for the isp part (on the three stats scripts). Awstats seems like it's functioning normally too...

Anyone seen this situation before?