Only the back and right edges are yellow on top. Headlights on the right, and the front-left corner's yellow faces you.
Algorithms
R' U' R' F R F' R' F R F' U R
12 moves
YOURS
F' L' U' L U L' U' L U F
10 moves · with the left hand
Built from
R' U' + Sledgehammer + Sledgehammer + U R
Loose moves
R' U'
Trigger
Sledgehammer
R' F R F'
Trigger
Sledgehammer
R' F R F'
Loose moves
U R
Relations
Mirror
OLL 48
Your algorithm backwards
R' U' F R' F' R F R' F' R U R
solves OLL 52
That's why your scrambles are never the inverse of the algorithm: you'd be practising OLL 52 without knowing it. CubeDojo builds a random state with this case and checks it comes out.