I live and work in Missouri. Why am I needing to adjust a Form MO-A?

It is saying that my Missouri Return needs to be fixed. It's saying that for Form MO-A: TP-Kansas/St. Louis Refund should not exceed the prior year state and local tax refund reported as taxable on your Federal Return. I have never had to deal with this and am not sure what to do.
Any advice or help would be greatly appreciated.