This has happened since I can remember on the drifting, only some corners/courses are affected though. There's also a bug whereby if you cut the corner at a really good drift angle, sometimes as you hit the apex the score just stops going up for a second or two and it ruins the corner and invariably the run, it's very inconsistent. With the specific issue in this challenge, I honestly spent ages getting annoyed at it months ago, you have to make a conscious effort to end the first drift on the corners affected, typically I tap the brake to straighten up as it usually means drift 2 scores better. I edited my post above earlier when I beat the original high score but it might have been lost so here it is again -
https://youtu.be/TlmCk8yp3oY
The trick to scoring is to start drifting from as far away from the zone as possible and keep as much speed as you can (as well as overcoming the bugged scoring in the first zone). Hold the car at the right drift angle as long as possible for the best scores, it's why people smash into walls because it gives them additional time travelling at the correct angle at high speed which always scores higher.
I have played very little else except the drifting since the game came out and it's a shame it's hated on so much because when it works it's amazing. They really need to look at the wall hitting, multiple drifts per zone, lack of any penalty for dropping below a certain speed and then the 2 buggy scoring things discussed here though, as it stands to new people it's a bit of a mess.
AbandonedTrolley, the second to last bend is the key, try drifting a little earlier, catch it at a more shallow angle and traverse the corner directly across the apex, rather than drifting round the final bend so much. See my recent video for where you could pick up those few extra points.