The IRS does not pay state tax refunds. You need to contact your state tax department. If you really already filed your state tax return and got your refund (that's pretty amazing this early) then the state will have to tell you why they reduced your refund.
The IRS has a fairly limited list of items that can be used to offset a federal refund. The items that can be used to offset a state tax refund will depend on your state's tax laws.
