Pamper cat food

I buy pamper saucy chicken mince for my cat. So I buy st least 20 tins a month. All previous tinder had a jelly tipe fat on top but then I bought this month 6 to find that there is a total difference in texture and colour. Yesterday bought 3 more find that it is watery and my cat does not want to eat it. I would like to know why would you put out a product that changes so drastic and smells