OK, now I've done confused myself.

The picture in the owners manual shows a scale from 1-10 on an old infinity cam.

The draw length module post chart shows some shorter draw lengths utilizing a 11.5 draw length setting.
So with that I can only assume you are correct in counting the first slash as a 1 and the last slash as a 12.
If so, I think it's time for a new illustration in the owners manual.

And if that's the case my draw stop peg is currently on the #4 setting.