I have an a Litter Maid self-cleaning litter box for the past five or six years and I love it! But recently the Fresh Step Kitty litter that I’ve always used in it does not seem to be working as well as it used to. Instead of clumping nicely to be raked up, it seems to form into a gummy mess that just sticks to the tines of the rake. I’ve double checked to see if the box says it is the clumping litter, and the box claims that it is. I wonder if they changed the formula. I may have to change brands!