Bests & Worsts Reviews from Amazon

I've bought this quite a few times, with no issues, I've loved the efficacy of this litter. However, this last time I bought 3 boxes, not the same stuff!! 1) The litter is brown and sandy..NOTHING like the litter that I've bought before 2) It's not clumping as it has always done, it's total crap 3) Because of this new texture my cats are trekking this crap every where. What the heck happened? Did I get knock-off stuff or what?