Incorrect grid order in 2 player career sprint race

A similar thing has occurred to me and my friend on two player career many times. My friend is on PC and I am on Xbox and very often despite how we qualify, when race begins we will be in a very different grid order. Sometimes one of us will even start race in pit row. Last night my friend started in pit row, despite having zero penalties or part replacements and so did 5 or 6 AI. The start of race was wild with half a dozen cars darting out of pit lane at same time rest of grid was rounding first turn. It also immediately put half the grid under a blue flag, despite nobody being a lap down. This has happened numerous times to me and my friend. It doesn't happen every single race, so i'm not sure what is causing the glitch.