The return display is dynamic. It changes with each additional bit of information you enter.
If you are following the interview process, you are going to enter your Form W-2 first. It probably has most or all of your income tax withholding, so you may show a large refund. As you enter other items of income that may not have withholding associated with them, the refund grows smaller. As you proceed, the refund may move up or down. No taxpayer's refund is final until their tax return is complete. Even then, it may be subject to correction by the IRS or to Treasury offset if you owe child support arrearages or student loans in default.
