State tax filing

I think that is where my problem is I'm not sure. I think I claimed income incorrectly, I worked in Kansas but lived in Missouri. I only realized it might be wrong because I'm in the same situation this year and realized I got all Kansas taxes back and then owe them to Missouri, minus the difference in the tax rate. Are there any other companies that help with old returns? if anything i think i would've gotten a larger return from Kansas and owed more to Missouri, i know i can't get the return from Kansas but if owed more to Missouri im not sure how to calculate that myself.