ND nonresident return

I have used TurboTax for many years as it allows me to purchase a non-resident return for the small royalty payments I receive from ND oil leases.  Suddenly, it shows a whopping refund amount.  This cannot be right, but I cannot tell where the error is located.  Since I paid no taxes in ND, and have not received a refund from them in prior years for the same amount of income, something is very wrong.  I show no other income on the ND return.