I'm going with Luuknoord's comment on this one. I saw zoos with thin terrain paths, but have to admit not sure in which order they built their zoo. Maybe they landscaped after placing the paths.
Barrier most times is the biggest issue with path placing.
So box all animals, delete the barrier (near that path), try placing the path again (and reconnecting barrier/unbox all animals)
At least worth a try..
Not experienced enough with the tracks of a ride, but maybe a path so close to a track, could be an issue (if the other option doesn't work)