I agree. It's frustrating but the simple answer is = we're not made up of math. Our metabolism is affected by lower calories, our BMR is not stagnant, you retain water more in certain environments than others.
So the short answer is, if you keep up what you're doing, you will lose weight. It's not going to necessarily happen in a week. It's not going to happen in a month, maybe. But when you look at your weight loss over the course of a few months, you will see that you've been losing if you stick to this plan.
The thing is, this irregularity is why people fall off the wagon. They do all the right things and yet they plateau. It doesn't seem fair. But your body is changing, even if you can't see it on the scales. So don't give in to emotional you and listen to rational me. The band works. Look at my pictures. It works.