What do you mean warped maybe post a pic or two.

Your tops have to be installed on flat and level cabinets to maintain the warranty. I doubt your cabinets are warping; the floor joists drying and shrinking are more likely.

Have you put a long level on it? A slight variation is often addressed with shims but in a brand new custom home I would expect the kitchen installers to be pretty spot on.

I love it when OPs disappear. I still need to know what she means .