W2 wrong?

Missouri DOR won't issue my refund and telling me my W2 is wrong because my income is listed twice in box 16 for the Missouri line and the Kansas line. DOR said that means I earned that same income in both states. I was told that my employer needs to show how much was earned in each state. I've never heard of that and my W2 looks this way every year and there's never been a problem before. I work in Kansas but live in Missouri, so taxes are taken from my check by both states. What's happened in the past is I owe Kansas and get money back from Missouri. Please tell me if Missouri DOR is correct.

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