I give up with the Time Trial leaderboards on this game now, either something is wrong at my end or they are using the worst system ever devised.
I have just played Single Player > Time Trial with the 346 Challenge, a brand new car which I have never used before. I set a time of just under 2 minutes at Monza, finished the session and it shows my time as 2 minutes 5 seconds something back at the track selection screen
Also the other times on that screen don't bear any relation to the times for the same mode, track and car on the Leaderboards section off of the main menu.
Very frustrating :/
I have just played Single Player > Time Trial with the 346 Challenge, a brand new car which I have never used before. I set a time of just under 2 minutes at Monza, finished the session and it shows my time as 2 minutes 5 seconds something back at the track selection screen

Also the other times on that screen don't bear any relation to the times for the same mode, track and car on the Leaderboards section off of the main menu.
Very frustrating :/