The program is correct.
Your legal state of residence can tax ALL your income, regardless of where you earned it.
A non-resident state can tax you only on income earned within its borders.
Therefore if you have non-resident state income, you must file both a non-resident state return AND a home state return. (The only exception is if the two states have 'tax reciprocity'.) You'll be able to take a credit on your home state return for taxes paid to the non-resident state, so you won't be double-taxed.
https://ttlc.intuit.com/questions/1901271-how-do-i-file-a-nonresident-state-return
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
