I think you set up the calculator backward - your "end of cut" weight is heavier than your "starting" weight.
You're 5'3" and weigh 154 lbs. And you're not a bodybuilder, so you're probably not particularly muscular now. When I was 170 lbs and starting out, I carried about 100 lbs of lean mass on my 5'7" frame, so let's assume you have about the same lean mass for our purposes. This would imply you're currently about 35% bodyfat now, and need to drop about thirty pounds to hit your goal of about 20% bodyfat, at 125 lbs. If I'm wrong, you'll hit 20% a little sooner than this, which of course will be a tremendous disappointment to you.
