DO NOT, I repeat, DO NOT get even two wheels onto the grass or it will discount your lap everytime. This has happened all over the track. You are fine on the curbs, but it is doing it on straights if you happen to hit the grass at all, even with half a tire on it. Just a warning to you all, stay off the grass.....LOL!!!!!
You have 3 options
1) Delete the Watkins Glen track folder and resync.
2) Delete the 9 road*.dds files from the Watkins Glen track folder.
3) Or if you like the dark color you can even leave it as-is, it wont hurt or mismatch.
Apologies for this but I cannot delete files via simsync, I can only add.
"Winners forget they're in a race, they just love to run"