This is a revisit of Are certain users favored the opportunity to review posts? that seems to have grown stale without any solid answer.
Just recently I was baffled by a user's ability to review a "First Post" almost 6 hours after it had been reviewed previously:
In my experience, certain review queues seem to be more inclined to "single-user reviews" (like First Posts and/or Late Answers), while others are more geared to "multi-user reviews" (like Close Votes and/or Suggested Edits). This does not seem to be the case here.
The "requirement" for such late, duplicate reviews are questionable and does seem privileged when considering the multiple examples in the First Post review queue (just even from reviews within the last month or so). Even being able to review already deleted posts (I highly doubt this was an instance of keeping the review window open for more than an hour and only reviewing it post mortem - first post reviews are dealt with far more quickly than most other review queues):
While these examples do not speak to the legitimacy of the reviews, it sure seems biased. Something is amiss...
Over at TeX.SE we have a far smaller community, so these situations are far more noticeable.
Edit: The following are all candidates for the above discussion:
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