Trying to understand why my state income tax is greater than zero

I am a TX resident, going to college in AR.  TurboTax says I owe $20 in tax to AR.  However, when I reviewed the instructions for AR state tax, it looks like my income is too low to owe any taxes.
I am not sure I want to pay TurboTax to file my state income taxes AND pay money I don't owe to AR.
How can I figure out why TurboTax thinks I have a $20 tax due amount?
I don't think I can look at the actual forms unless I pay TurboTax first.