My black copper maran hen refuses to use the nesting boxes. She insists on laying on the poop board under the roosts.The poop board is covered in PDZ. She settles in the corner and lays there. I clean every day, so it's not terribly dirty, but still....Gross! I have 10 layers and 3 nesting boxes. All of my other hens will use the nesting boxes. Any idea why picky Holly would prefer the poop board to the nice nesting box??