DeltaLima says he re-flagged the post, but the post is not in the review queue. Does the system prevent a post from being reviewed twice? How does the review system work?
Ok, since I've since found out the answer, to avoid others from stumbling on the same issue, the following meta post gives the answer:
If the post has already had a Low Quality review task, further flags will only appear in the moderator flag queue unless the post has been edited since the last task was completed (or invalidated).
So the posts could go twice in the queue.
It is rare, but there have been cases of this happening.