Earlier today I reviewed an answer which was flagged for its content and length. Now I reviewed again the very same answer.
How can this be possible?
These review queues serve different purposes, and going through one of them doesn't bar a post from the others. A post could even appear in all three of First Posts, Late Answers, and Low Quality, though any individual reviewer won't see it in both of First Posts and Late Answers. I'm pretty sure a post can't go through the Low Quality queue more than once, but it's possible to see a post in that queue and one of the others.