Take a look at your return. If you are a resident, you have health insurance and other answers to be sure you got right. If your family lives in IL, you are probably a resident. If your family is elsewhere and you are in IL for school, temp job, then you are a nonresident.
Double check that you are filing the correct return. Take a look that the income is correct along with the tax withheld. Typos do exist. Look for any extra taxes on your return. It could boil down to the employer just did not withhold enough tax.
To see your forms:
See Why Do I Owe on My Tax Return?
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