回複：請問大家有沒有類似的情況？關於我母親來美國的簽證問題

The embassy usually double checks on all information in the application forms before officially issues the visa. Is there any mistakes on the information? But either way, they should give you an explanation. If you are in China, your wife, who's the us citizen, can go to embassy directly... see more information on the embassy website

Good luck.