Corner above the slot with white facing right; the edge is in the slot but flipped.
Algorithms
U F' U' F U' R U R'
8 moves
YOURS
U2 F' U F U R U R'
8 moves
U2 F' U' F U R U' R'
8 moves
U2 F' U' F U2 R U2 R'
8 moves
Relations
Mirror
F2L 35
Your algorithm backwards
R U' R' U F' U F U'
solves F2L 31
That's why your scrambles are never the inverse of the algorithm: you'd be practising F2L 31 without knowing it. CubeDojo builds a random state with this case and checks it comes out.