Did you use the "add" or the "update" link? If you use the add link, sometimes the reviewer won't notice it's an update and will delete it since it is visually flagged as already listed. It looks like the submission was deleted along with a bunch of others like that. If you use the "update" link, the submission will be visually flagged as an update.
[added] unless you submitted more than once. In that case, the duplicate submission may still be there. Someone with privs there will have to come along with more info.