Here explanation for N and S, not applicable here https://accountants.intuit.com/support/en-us/help-article/state-taxes/using-source-column-understand...

What is the filing status?

You cannot take the standard deduction if:

• You are a married individual filing as married filing separately whose spouse itemizes deductions.
• You are an individual who files a tax return for a period of less than 12 months because of a change in your annual accounting period.
• You were a nonresident alien or a dual-status alien during the year. However, nonresident aliens who are married to a U.S. citizen or resident alien at the end of the year and who choose to be treated as U.S. residents for tax purposes can take the standard deduction. For additional information, refer to Publication 519, U.S. Tax Guide for Aliens.
• You are filing as an estate or trust, common trust fund, or partnership.

Did you somehow make them a non resident alien? In Client information - State PR and Check the box for Full Year Resident and NOT check the Multi-State?