DFW

OK we have completed our pinewood derby car and I tested it last night on my 5ft glass tuning board, the car is set to steer towards the non-DFW 4in at 4 feet. I installed a center guide rail made of wood on my tuning board and when I roll the car down it steers into the rail but my DFW does not migrate out towards the axle head. My question is have I done something wrong or is that normal? Thank you guys for all the help on the build.