If you notice your food tray coming out empty, give the food dish a wipe! The Hub uses an optical sensor to determine whether to add kibble to the tray. If the dish is dirty, the sensor may detect slobber or crumbs and think it's food. Try wiping the dish clean, then unplug the Hub and plug it back in!
If you notice this happening even when the dish is clean and dry, reach out to us at firstname.lastname@example.org and we may be able to update the settings of your Hub's sensor.