That's not for your federal refund, is it? At the end Turbo Tax shows you the combined amount.
Check over your state return and see if you made any errors like for withholding from your W2 box 17.
I would check over your return and see if you can see anything wrong especially in the payments section. Make sure you agree with all the amounts listed. Like is the difference the same or close to the refund you got last year? Maybe you put down that you applied last year's refund to this year? Or you put down you made a payment with an extension or paid an estimated payment that you didn't make?
The state will mail you a letter saying what they changed.