A problem that might be related to those already mentioned: if one enables driver names, they can see right around the start line how positions of the drivers in front change several times to different numbers, mostly lower than their actual places. The same with the player's position, and correspondingly Crew Chief reports a wrong position, and in the SubStanding app the order gets shuffled back and forth. This goes on until the second corner (Manson), after which the driver regains their real position. Of course, if the field is spread out, the order in the standings table may be juggled all the time.
I'm guessing that this could be caused by the same issue that manifests as the malfunctioning pit lane and the broken delta timer: something is misplaced around the pit lane or on the first two straights. Perhaps the game misunderstands how exactly the route goes on in that area, and thus miscalculates the car's actual location along it.