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Constellation

Watch active v1; wrong distance and time

Hi all,

I ride my bike a lot on trails. Normally i use a Garmin bike GPS with pulsebelt. 
yesterday i just used my galaxy watch active v1 with GPS activated. Nothing extra; neighter software or anything. After my ride i started to wonder...
today i used my Apple watch 4 on my left hand, the Samsung on my right hand and my Garmin bike GPS computer with pulsebelt. My Apple watch and Garmin GPS had the same result; 17,6km with avreagere speed of 18,8km/h, while the Samsung had 11,5km and 0,7km/h avreagere speed. And; the Samsung claimed my body consumed less than 300kcal...... 

Are there something seriously wrong with my watch? Anyone?