[NSFKD puzzle] Turntable in 17 moves?

Hi. I got stuck on various parts of the train puzzle. I looked some stuff up, which was sick because it meant I got spoiled on just about everything else about the game. Really cool. Anyway, every other person I’ve seen had 20 moves for the turntable puzzle, or more, and all the solutions I’ve found are in 18 moves, but on my game I only have 17??? No idea if it’s because I was doing the puzzle on hard mode or what, but as far as I can tell there is no 17-move solution to save me. Am I just fucked? Has anyone else had this same problem?