A C shape: the front and back edges with the two left corners, and a full yellow bar on the right side.
Algorithms
R' U' R' F R F' U R
8 moves
YOURS
Built from
R' U' + Sledgehammer + U R
Loose moves
R' U'
Trigger
Sledgehammer
R' F R F'
Loose moves
U R
Relations
Your algorithm backwards
R' U' F R' F' R U R
solves OLL 43
That's why your scrambles are never the inverse of the algorithm: you'd be practising OLL 43 without knowing it. CubeDojo builds a random state with this case and checks it comes out.