A yellow 2×2 square on top. Hold it at front right: the front side shows no yellow.
Algorithms
r' U2 R U R' U r
7 moves
YOURS
(U2) l' U2 L U L' U l
7 moves · with the left hand
Relations
Mirror
OLL 6
Your algorithm backwards
r' U' R U' R' U2 r
solves OLL 8
That's why your scrambles are never the inverse of the algorithm: you'd be practising OLL 8 without knowing it. CubeDojo builds a random state with this case and checks it comes out.