Treadmill Calibration not sticking ?

Hi 

I on the lastest official firmware 14.10. I've been running on the same treadmill for 4 days now. At every run it has showed a 2 km difference, which I correct in the watch by calibrate and save option. The strange thing is that it should reduce the difference in the following runs which it is not doing. 

It's like it is not sticking and the calibration itselft is not being done. 

Anyone has see it ? Any suggestions ?

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