I found a small bug:
this bug occurs only with some karts and some tracks
for example use china or fort magma
and as a kart use nolok
then start the race
then restart the game directly (before or while ready-set-go), then you reset
you have the same bug with elephpant(but not extreme like nolok)
for this use fort-magma(for me it doesn't happen in china), but you have to restart twice (after the first restart, nothing happens, but after the second, you reset or if you don't reset, your kart has another position on the road)