I think AI just resigned because it doesn't know how to offer a draw. A bug in Stockfish. If you can maintain +/-1 after 150 moves, Stockfish will resign.
@subs197 i thought it was too risky to break open the position as the computer would outplay me so i chose to repeat the position and hold on @Morozov my other rook was well placed so i decided the move the other rook back and forward and see how the computer could improve and it could not find it :D