Extract profile from ride modifies stats of the same ride

[sjeffrey]

I'm trying to extract the profile from the ride I did yesterday and when I do a switch profile after-the-ride the stats like average power change.
If I extracted the profile from the same ride it should be unchanged shouldn't it? The numbers for aero and friction are the same.

[Velocomp]

Isaac attempts to reconstruct the power numbers from the data it downloads.

The internal calculations of your device are based on more accurate sensor data, so I would not worry if you see differences when Isaac recalculates things.

[Amo]

I have exactly the same issue. However, if I don't switch my profile after the ride (to the same profile stored on my powepod) Isaac reports an average power around 10 W higher than that broadcast to and recorded by my Garmin. Very odd! Can Velocomp advise? Am I missing something?