Level 9 may get locked by the selector pattern, as it only cycles 16 of the 22 characters and one position can't move if selected by arrow jump.
It's sometimes possible, but it's unclear what causes the selectable set to change. I had thought move order or board layout, as I was able to do one move twice after swapping character positions after 30 or so tries without swapping, but I'm now unable to replicate so perhaps just bad RNG luck.