In a question which was put on hold, the last user named in the reviewers list of five has an Arabic username. Because of this (as far as I can tell), the number of hours ago that the post was closed was moved to the left hand side of the last name in the list (I guess because Arabic is a right-to-left language).
I doubt this behaviour was intended. It's also possible that it affects more than these lists of reviewers, though I can't recall any other examples of this happening.
OK, this was a fun one. Thanks for bringing it to our attention! I've modified the display of usernames in Post status blocks and revision history to prevent this odd display. An additional change was made to the revision dropdown: the new format is username - time - comments. This will be live in the next release (> rev 2014.7.2.1690).