Health app: wrong walking + running distance after iOs 8.4

Hi, after iOs 8.4 update on my iPhone 5s, the walking + running distance drops to nearly 0; the average of steps remain more or less the same, but the distance is approximatly 10%.

For example, I walk every day 1.3 Km going work, but now the app tracks only 0.2 - 0.3 Km (and the same number of steps).

I tried to hard reset, restore from back-up, delete the apps that share data... Even with iOs 8.4.1 update.

Anyone with the same problem (and fix it)???

Thanks,

Andrea