speed variable gets heavier with speed so if you do have it then its working backwards. i think you're experienceing the effect speed has on steering in all cars. it hard to turn the wheel when you're at a standstill, the faster you go the easier it is to turn, its usually difficult to notice that effect on pas cars but it is noticable, especially when leaving the motorway, but you get used to it after a few secs so the change appears to go away.