Interesting Observation

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I bought a new fitness tracker/HRT etc. It is a New Balance Life trainer. So I go to my favorite walking trail that is 1 mile through steep gullys and gentle downhill terrain. So I set up my gizmo to Workout and start my walk. Well it says for a 2 mile walk my mileage recorded was 0.84 miles and I did 2293 steps, burned 307 calories in 32 mins. So I put on my good old manual pedometer, it said the 2 mile walk was 1.44 miles, 3158 steps burned 155 calories in 31 mins. So I used satellite navigation and tracked my walk, said I did 2 miles in 35 mins no calories burned or steps measured. To say I don't know what to put in MFP for calories is an understatement. Any thoughts?