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Distance and speed in FR955 and Tacx Training App differ

My first ride with FR955 connected to speed and power of the Tacx Flux produced a distance of about 10 km for the Android app, but 6 km for the Forerunner (it was only a little test ride with 135W average, 20 minutes). How is this possible? Shouldn't both get the same values from the trainer? The FR values seem much too low.

I'm on FW 12.23. FR is not connected to the Flux as "Trainer", because I want the app to control the wattage. 

Is it working correctly for anyone else? Probably there's no way fixing it other than a new FW version?