I have had this strange thing happen a few times. I watch a replay after racing (press 1) then I go to restart, it gets stuck in blue screen, then I try to restart again and end up in the AI car fighting the AI trying to control the same car. In this case the cars even swapped color. I had a black XRT and the AI had a yellow FZR, after this happened the FZR was black and the XRT was yellow.
This has happened in patch U, V, and now W.

Edit: apparently I can't reset with the AI car either. Haha, does not fix when you restart either...