Mr Flippant is right in that I had this issue with several Hall sensors: when the car goes over a lane changer then the sensor reports as crossing the start finish lane.
However, this was not during a track call but during racing.
We use RCSO2 with automated track calls which stop the cars on the track.
I am not sure if in PCLP the track calls are more like a yellow flag where cars can still go around but at a reduced speed.
Is this issue happening with all the cars or only some?