Well, I only had this problem once, and it was when I went away for a weekend and left my Princess with my boyfriend for a week after I returned she left a "prize" for me everyday on my pillow. I think cats do it to rebel, maybe there are to many cats for her, and she feels like she isnt getting enough attention? I would Imagine having 8 cats is a hard job. I only have 3 and Its hard for me! Good luck! Keep me posted on how you kitties are doing!