Yesterday (10/13/10), I was on UAL388 TPA-DEN. Channel 9 was turned on the entire time so I was able to accurately follow the flight (and looking out the window confirmed). The route was out over the Gulf via the SYKES3 then SIMMR REMIS Q100 REDFN, etc… We arrived in Denver on 35R.
After we landed, I checked FlightAware and the route was shown correctly, i.e. the left turn after departure, westbound out over the Gulf, and then the northerly landing into DEN. This is all in agreement with the filed flight plan: SYKES3 SIMMR REMIS Q100 REDFN Q105 HRV EIC J20 IRW J98 LBL J52 LAA
However, today if you look at the flight history map for UAL388 on 10/13/10, it’s showing a completely different route that we didn’t actually fly, (but still referring to the correct flight plan). This new plotted route even shows an western arrival and landing into DEN when we landed north. The tracklog lat/long and the plotted map are in agreement, but reality and the map are not. 
It’s like the actual flight history was overwritten with bad data… ?
flightaware.com/live/flight/UAL3 … /KTPA/KDEN
What’s showing now:
http://img139.imageshack.us/img139/5158/ual388wrongmap.jpg
What would cause the map to initially show up correctly but then change to be incorrect.