Small glitch on the P1 Mclaren

When you have the Forza rear spoiler
the stock tail of the P1 glitches a bit nd sticks up through the body and its slightly crooked…
looks a little weird…
it bugs me not sure why though
only happens in a race (didnt get wrecked so i know its not the crash physics)

almsot looks like the stock rear spoiler replicates then glitches upwards at a slight right angle perpendicular to the car

TL:DR version
Mclaren p1 aftermarket spoiler= glitch