Yes, I too have seen some strange Fuel TOT readings on the ER, around 1000 kg's difference in CALC and TOT in cruise.
The Left and or Right gauges can fluctuate quite a bit after shutdown.
And we do seem to shutdown with up to 1000 kg's less than FMC predicted FOB. ( even after flying the exact app we programmed in )
Thanks the info Old Smokey I'll ask out tech reps what gives.