Chuck and Angel have this weird habit of making nuggets or balls out of their food. Must have something to do with the way their tongues swipe at the mushy mess, but it's a bit puzzling just the same. In the end, they always come back and eat up those too, leaving only bitty dry crusts stuck to the bowls. Oh well; no harm, no foul...it's just another cat thing that make humans shrug their shoulders!
By the way, we use Corning Sidekicks as cat food bowls; the sides are low for no whisker fatigue, and they wash up like a dream (or, so The Hubby says...) The bottoms are smooth; so many bowls made especially for cats have rough or scratchy bottoms that would mark the wood floors. We already had several Sidekicks in the house to press into cat bowl service, and I purchase any that I find while out at the resale shops, if they are in good shape and cost $2.