Forum:I, Zombie Endless: Scaredy Layout question

So, here's my question. How come I never get the Scaredy Layout? I have literally never once encountered it, and I've been playing this game for a few years now. It's the GOTY edition, so I suspect that has something to do with it. Is this a bug of some sort? Is it even possible to get this layout in GOTYE? Seems like something is cutting it off, making out like it never happens.

Also, sorry about that last joke. Couldn't resist it. Question still stands, though?