Sus!

I have been using Skin Republic's Salicylic Acid for a couple of months now. I usually purchase it at Dischem or Clicks. I have noticed that when I purchase it in certain areas, cashiers need to fetch the product out of stock. It is not in the purple box it usually gets sold in until paid for. I noticed a difference to the bottle, consistency of the product, the scent of it and the feeling of the product on my skin compared to if I purchase it in a different area. I am paying the same price no matter where I go so why does it feel like a different product.