Turbo Tax Flags an over-payment of SS

My daughter worked a bit for a restaurant and her W-2 shows $631.50 in boxes 1, 5 and 16 with $39.15 in Social Security tax withheld (box 4). I have entered and reentered these numbers to be accurate. However, Turbo Tax flags it and tells me she overpaid her social security and lists her income as $601.50 and Social Security tax as 37.29. I have no idea where it's coming up with these numbers.