We would need more information such as how much was your carry forward and the numbers that you have on lines 16 through 34.
It could be that you have other credits that are resulting in a refund. It could be that you have a typo or entered an amount withheld and something in estimated tax payments.
Your tax liability is the amount on line 18. It is the total amount of taxes you are responsible for without consideration of what you have already paid in. What you pay in, is just a payment towards your liability. So, if you have a liability of $10,000 and you pay in $5,000, but you have total nonrefundable credits of $10,000, you would get your $5,000 back that you paid in because the credits would bring your liability down to $0.
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