Delta Class - Not all cars available?

Hello, why are there several cars in Delta Class not being allowed to use during hot lapping? I tried using TC Scion and Mini Cooper in Delta Class with builds and tunes I got from the community and it will not allow me to use them to hotlap Does anyone have an answer?

Mexico1975

sort your cars by, 2 window button, right, a, x, go to d class and all your d class cars are there.

Turn 10 mentioned some cars in D-Class were performing beyond their limits. They banned them from the leaderboards.

Not sure if Turn 10 are ready to un-ban the cars yet.