I have a client with a W2 where it shows two states (IL and NC) in the state part, Box 15 of the W2. What confuses me is that the state wages for IL in Box 15 are exactly the same as the total wages in Box 1 ($10,150). And the NC wages in Box 15 are for $5100. Shouldn't Box 1 reflect a total of the two state wages  ($15,250). Or, could there be a mistake.