I did the canyon expedition with my friend then when I had finished the event my PI rating was kept at the 767 of the porsche used in the event despite me being in an s2 rated brabham bt62.
After this i decided to play rivals as it wanted to post some laptimes. After completing a laptime that was in the top 200, I realised that the PI rating on the leaderboards had stayed at 767 despite being in the D-class leaderboards where the maximum should be 500 PI points.
I attempted to restart both my game and my xbox to see if this would resolve the bug but it is persistent on the leaderboards although I am unable to check if this is only an apparent bug for me or if it can be seen by others aswell.