Ok, so I've installed three different site trackers (different services) to various pages in my sites...(I know, I know...a bit overboard...)

BUT! Each tracking service returns VASTLY different results in terms of unique visitors and page views...One of them I KNOW has to be wrong (underestimating) based on the number of "user added content" each day...

All of the trackers are installed at the bottom of the pages, and right next to each other...

Any thoughts on the disparity?
(btw, the trackers added are SiteMeter, WebTrends, RealTracker)

Thanks!