When submitting an article, the author may pick and
choose appropriate categories to classify the article.
However, it appears that when the submission is
reviewed, the categories must be selected all over
again. They have been dropped.
Admittedly, a moderator might be better able to pick
and choose the correct categories but under 1.9.2 it
appears that any effort by the submitter to categorize
the article is tossed.