9, 18, 27, 36, 45, 54 and so on are all the same symbol. That is because those are the only ones you can get.
For example you take 10 its gonna be 9, you use 11 its gonna be 9, you use 12 its gonna be 9 and so on. So 20 is 18, 21 is 18 etc...
It's cool til you figure it out I guess, then you just feel stupid for lettin it fool you