Corner above the slot with white facing right; the edge is beside it in front, already paired with it.
Algorithms
U' F' U F
4 moves
YOURS
F R' F' R
4 moves
U2 F' U2 F
4 moves
Relations
Mirror
F2L 1
Your algorithm backwards
F' U' F U
solves F2L 3
That's why your scrambles are never the inverse of the algorithm: you'd be practising F2L 3 without knowing it. CubeDojo builds a random state with this case and checks it comes out.