Nadra Wilson of Lynchburg, Va., was concerned and confused when she received a letter in the mail from local election officials notifying her that her U.S. citizenship was in question.

The notice said she needed to affirm she was a U.S. citizen within 14 days or her voter registration would be canceled. It was first sent to an old address and then was forwarded. By the time Wilson received it in October, the deadline had passed.

But Wilson was puzzled by the letter. “I was born in Brooklyn, N.Y. — I’m a citizen,” Wilson said in an interview with NPR before showing her American passport as proof.