Александр А.

Погодите ка. Читаем правила:
On your entry, you must list your spouse (husband or wife), and all living unmarried children under
21 years of age, regardless of whether or not they are living with you or intend to accompany or follow to
join you should you immigrate to the United States, with the exception of children who are already U.S.
citizens or Lawful Permanent Residents. A spouse or child who is already a U.S. citizen or a Lawful
Permanent Resident will not require or be issued a DV visa. Failure to comply with this instruction can
result in the disqualification of your entry.

Не написано, что надо указывать всех детей супруга(и). Я не вижу во всяком случае.

Далее, читаем пункт 14 Entry form:
Children include all biological children, legally adopted children, and stepchildren who are unmarried and under the age of 21 on the date that you submit your entry. Failure to include all children or inclusion of children who are not your biological children, legally adopted children, and stepchildren (regardless of whether they live with you and/or intend to apply for a visa as your derivative) is grounds for disqualification of the entire entry.

Здесь указываются пасынки/падчерицы. Немудрено запутаться. Получается, что дочь мужа подпала под определение "падчерица"? Сочувствую автору темы, мне кажется что такая ситуация скорее случится чем нет.

Может, попробуете обжаловать? Запутался, ошибся, всё такое?