Activity distance inaccurate

[2Flo9]

Hello,
I'm discovering today that all the activities triggered automatically no longer mention the calories burned but the distance (in the "Days of exercise" page). These distances are ALL between 0 and 1 kilometer, whereas my activities are about 9 kilometers. So Fitbit doesn't know how to calculate distances for automatically triggered activities. It assigns a completely crazy distance.

I am frankly fed up with Fitbit!!!!

Moderator edit: updated subject for clarity

[JohnnyRow]

It might help to know what the activity is called.

[2Flo9]

This is the activity name assigned by Fitbit by default, and cannot be changed (which is another big problem with Fitbit).
In this case, the activities named by default are for mountain biking...