Anybody else's cars PI change?

I was playing online in C class and tired to use my C class 500 PI Kia Cee’d which I have not changed since I first tuned it and was told it was illegal. After I was done online, I went to the upgrade section for the Cee’d and the car was now a B 518.

I have almost everyone of my cars tuned to the top PI per class, and I have not seen any changes in the PI. That is an odd occurrence, not sure I could come up with a good reason.

I did have someone complain to me a while back that the Cee’d in C class is not fair. I wasn’t sure if there was a problem with it and they nerfed it somewhat. I don’t think it is a leader board car at all.