Gibbons,although I love them with all my heart,cats can be incredibly frustrating,unlike some dogs who eat anything.
I too leave dry out for them and it seems they are just snacking and through all the trial and errors I have them back on "Chicken-soup-for-petlovers-soul"dry,which they love,they eat canned in the morning and at supper,they also all drink plenty of water.
If the wet food sits and get dried out(not in my house
)I doubt any of mine would eat it,if it is not eaten within an hour,I would throw it out.