It could be due to many reasons. For example, do you have any IL tax withholding on your W-2? You might not have answered all the state tax questions correctly in the program.
Without seeing your tax return, it is hard to say. I would suggest you consider our new product / features TurboTaxLive to file your 2019 taxes to have one of our tax professionals to take a look. In the TurboTax program, once you complete your taxes, before you file, you’ll be given the option for a final review of your return by one of our tax professionals. After they completed reviewing your return, they’ll inform you of any proposed changes.
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https://ttlc.intuit.com/replies/6071042
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