Were you a resident of both states during this year? Or are you a resident of one and a non-resident the other. If the second is true, then it should be fine to have reported income in both, but you should receive a credit for taxes paid in your non-resident state so you are not paying duplicate taxes. Make sure you answer the resident questions correctly. And if your employer has the wrong address of residence, that changes how they write up your W-2.
