There are two issues with out of state returns. First, you have to manually allocate your income. If you have a 1099-R for IRA or pension income, Turbotax doesn't know automatically how it should be allocated. Make sure you have manually allocated it all to your home state.
Second, many states determine your tax rate based on your total income, even though that rate is only applied to in-state income. So the state needs to consider all your income to set the rate for your in-state income.
@TomD8 is a good expert on multi-state issues.
