Unfortunately I don't have the Massachusetts software on my computer, so I can't duplicate your situation.
Another user had this suggestion, that might be worth a try:
https://ttlc.intuit.com/community/taxes/discussion/how-to-change-state-filing-status/00/671771
Also, make sure you didn't enter anything on your federal return that belonged to your husband, such as a W-2 or 1099. The only information about him that should be on your return is his name and SSN. It seems like something is making the program think you are filing a joint state return.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
