Running speed below the established (Kenshi)

Good afternoon.
There was a problem with changing the speed of the character's running. On one character with a speed of 55 km/h the real speed is much lower than those who have 29 km/h (all other things being equal: there is no overload, injuries too). Over time, I noticed that visually it moves at the same speed as in stealth mode (in stealth mode does not indicate speed).
Tell me how to fix it?