MjAMjAM 6 x 400g

My two tomcats always ate this food. Then over the summer I switched to the pouches, no problems at all. But now with the cans, they won’t even look at it... Do the products have different ingredients? Such a pity, now I have to give the food away :/

The food was good at first, but now it's awful and smells terrible. I don't know what ingredients are in it, but I'm sure there's only a trace amount of meat. My cat won't eat it anymore, even though before he used to eat only this food.

How is it possible that the small can is fine, but then the cat vomits and has diarrhoea?