If your floors aren’t level or if they’re carpeted, your kitchen bin may be wobbly, so its scale at the bottom of the bin might not get an accurate reading of the kitchen scraps you’ve added. With an inaccurate reading, the bin may not run Dry & Grind cycles as often or as long as needed to make Food Grounds.
You can use a wood shim or prop up your bin on a sturdy item to get it level. Just make sure your shims are directly under the rubber feet of the device so that all four feet are level, and it gets an accurate mass reading.