As an example, I just drove the Airstrip Drag race several times in a row and finished between 0:58 and 1:03. I should get the Expert achievement for this race with a time below 75 seconds (1:15), but I didn't. Same with the Indy Air Race, where I finished in 0:38 and a time below 70 seconds (1:10) should trigger the achievement.

I don't know if all Expert achievements are affected, as I already have those of the older races. The new ones are definitely not triggering however.

It's nothing really important, but something that someone should look into.