One thing I've learned about the Follow-Me tool is to be very selective of where I start the face on the line to be followed.
If I have a perfect circle or arc to follow, it really does not matter. 99 out of 100, the face is perched on a line segments vertex.
But IF the line depicts a non circular CLOSED curve, it seems to matter where on the line the face is perched. It almost always has to be perpendicular to and ON the line, NOT at a vertex.
If the curve is open, then perch the face at the start of the line; but it must be perpendicular to that start line segment.
Doing that has reduced the anomalous results dramatically.