Finicky with Cat Food

The cats eat Friskies Grillers dry cat food. They have it available to them 24 hours a day with bowls set out for each one. 

We fed them wet food for a while but they stopped eating it for several weeks until we bought them the wet equal to the Grillers. 

The wet food comes in both 3.3 oz and 11 oz cans. They will NOT eat the food from the 3.3 oz cans ONLY the food from the 11 oz cans. Same food but when they're given food from the small can they sniff it and walk away. One even scratches the ground next to it as if to cover it up. 

We can't figure it out. They do like these: