In Codemasters' GRiD, all the cars seem to "sway" back and forth slightly on straightaways, with no control input. Is this normal?

Edit: After more experimenting (I didn't have the game installed when I originally asked), the sway only happens when steering, like when you come out of a corner. There's sort of a pendulum effect. Even when your wheel is centered, the in-game wheel sways back and forth, less and less each time, until it eventually stops. I've confirmed that this doesn't happen when the game is played with the keyboard.