I don't know if this is the problem, but since you're filing MFS, did your spouse possibly itemize deductions? If so, you cannot take the standard deduction. You must itemize too. See page 17 of this reference:
https://www.oregon.gov/dor/forms/FormsPubs/publication-or-17_101-431_2020.pdf
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
