I have Screencaps here of ways people may be cheating.

[Panicatthedisco]

People have nice customized roadsters by now, they've had plenty of time to cheat.

[Sir Ernie MacGloop]

The only one I call tell could be glitching is on the leaderboards for all time records in screwball stadium, I believe it is impossible even with speed boost out of every present to get under a minute for Screwball stadium.

My guess is he is not doing the race, just going the wrong way over the finish line and back 3 times.
Hope they fix it whatever it is.

[toontown]

Wow! Fun lol

[Panicatthedisco]

Yea sort of like in Mario Kart there's a level where you can go off to the right off of the road and it counts as a lap and you keep doing that until you're done. Maybe it's similiar.

[Violet1]

she got in a bad car accident lol