Changes in weight are the result of consistently being in a caloric deficit or surplus over time (and, of course, maintaining body weight is the result of being near caloric maintenance over time). With that in mind, we start with weekly calorie goals when generating a nutrition plan. The weekly calorie goal is determined based on your calculated energy expenditure and your goal (weight gain, weight loss, or maintenance).
With a "Coached" or "Collaborative" nutrition plan, your weekly calorie budget is locked in, so increases in daily calorie targets one day will decrease calorie targets on other days (or vice versa) to ensure that your weekly calorie recommendations are appropriate for your goals.