Weight Loss Tracker

Hi, I'm fairly new to the app. I've been updating my weight for the last 6 weeks but it doesn't show on my profile how much I've actually lost. Is there a way to update my weight so it translate to the scale on my profile page. I started out at 18st 12lbs, currently down to exactly 17st but the scale on my profile just says I'm 17st as if it were my starting weight