[Need Help] Championship Low Graphical Detail Problem

I play on a middle-end laptop, and always set Display-Opponent Detail as "low" and Player Detail as "high".
In Single Race mode everything is normal, but in Championship mode, my car's actual graphical detail is always low. When I set Opponent Detail as "high" then start a new championship, my car's detail actually turned into high.
Is this a purposive design, or just a neglect? I prefer Reiza to fix the correlations uniformly, letting the player car's detail level accord to Display-Player Detail setting.