Zillow hiding active listing

I just posted one of my properties on Zillow and was not getting any responses or offers. I go check my listing on my pc where I was logged into my account and it was there.

So I decided to use a von and search for my property and it was not there, I then went to the library and lo and behold it was not there.

How many other houses are they hiding ? are they doing this for a reason ?