Offset loop - doesn't follow the topology flow-may not create a complete loop ...

[ForrestGimp]

If the shape isn't of a straight form, Offset loop doesn't follow the topology flow (faces flow) instead it follows the original loop, and may or may not create a complete loop and may flip or delete faces, I personally don't use it or rely on it.
Video in the Zip file.
QFT-Offset loop.zip