Well, yesterday I took a look on my Buddy-Screen and what a surprise to find the kilometers walked in negative...
The first time it was in -4.9/5 kilometers, but without thinking I don't take a shot and went on walking.
The next time a took a screenshot and here it is:
As you can see, now it's in -3.6/5 kilometers and 161.9 kilometers all time.
After this I have gone to see with friends football in bar near our house, so I think I have walked about 600 m going and coming back.
At home again, I looked and the counter has turned to positive again.
Now it's in 3/5 kilometers, but the overall counter has rised to 168.5 kilometers, so the app thinks I have walked 6,6 kilometers, but no Candy for me...
Today the situation is:
The counter in 0/5 kilometers, a candy is given and the overall counter is in 170.5 kilometers.
In summary I have walked from -5 to -3.6 = 1.4 kilometers; from -3.6 to 3 = 0.6 kilometers and from 3 to 5 = 2 kilometers; overall 4 kilometers for candy of 5 kilometers, and the overall counter has risen 10 kilometers.... not so bad this bug...