Solved

Level wiped and Reputations points removed

What did you try to do?
Exited from the race back to the main menu

What happened instead?
Rather than gaining Reputation I lost 6874 and I was reset to level 1

Did the problem happen while using wi-fi, mobile data, or both?
Wi-fi

Did the bug happen in the app, on PC, or both?
App

What is the model of your device?
iPhone XR

What is the operating system?
iOS

What is the version number of the operating system?
12.2

Can the bug be reproduced?
I"ve no idea

Additional comments:
I’ve a photo of the issue

It’s only a visual bug. Your reputation and level are normal. I’ve seen -10000 reputation in the race review screen a couple of times for myself.