@Cheridast78 Although what I posted above is correct regarding state tax law, what you describe almost sounds like income was doubled-up in some way. Since we don't have access to your account or return in this public forum, first double-check what the entries were in the Montana return, and see if there was any manual input that might have created an extra-reported income. Many income items carry over automatically from the Federal entries, and there's no need to enter a second time on the state side.
If you find something that is fixable on your end, you will then need to prepare an amended return for Montana if they've already processed it. This Help Article provides instructions on this: I need to amend my state return (2021 amended returns are not yet functional, but will be soon).
If you do not find something obvious we may be able to take a closer look at it. Please tag me @DanielV01 if that's the case.
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