It sounds like on your W2, box 16 for Indiana has the full amount of wages matching box 1 which may be correct in some circumstances. Whatever is in box 16 for IN cannot be changed however adjustments may be made elsewhere if needed.
If you would answer some clarifying questions we will be able to see the situation more clearly and give more specific instruction.
Did you work for the same employer while living in IL and IN?
Where is the employer located?
Did you get two W2's or one W2 with two state lines?
What is being reported to IL on your W2(s)?
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