Solved
As a non IL Resident, I filed a W-2G - Federal and State taxes were witheld at Issue. Turbo Tax showing large number(about 8x what was already witheld as refund to me which does not make sense) for IL state refund.
When you see numbers like that don't make sense, go back and check your initial entries. In this case, go back to the federal side of your return and make sure you did not enter a wrong value in boxes 13, 14, and 15 from your W-2G. If you see nothing wrong there, check withholding amounts entered from other forms.
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