Why should I owe IL so much money?

This is the second year in a row where TurboTax has calculated that I owe the state of Illinois a high amount based on how much money I made in IL. I made 2,068.04 in Illinois this year and it's saying my total amount of taxes due is $250, of which I've already paid $102, so I should pay $148 to them this year. Why would I still owe them that much money? I always mark 0 exceptions on my W4.