Start of the race brake glitch

I was in a multiplayer race yestr\erday evening, and when the race started my car just wouldn’t move.
I was aplying throttle, but it seemed as if I was braking at the same time, as I did see the brake light flicker on and off.
I wasn’t braking and holding the handbrake either.

https://twitter.com/THR_7MotorSport/status/922920678742827008