Exactly where is it showing? A State Tax Refund is taxable on your federal return if you itemized deductions on that prior year's federal return and took a deduction for state income taxes instead of the sale tax. You got a deduction benefit for it so now you have to include it as income. If you took the standard deduction it is not taxable and you don't need to report it.
If it is taxable it will be on Schedule 1 line 1 which goes to 1040 line 8.
