Board Thread:Questions and Answers/@comment-77.98.112.7-20140625014419/@comment-3241231-20140626035057

Another possibility is that it could be a banned/suspended account (that is set to a low level) that had attempted to start playing again. I don't think that banned accounts generally have their runes reset, and those could make a large difference in their PvP strength.

It could also be a developer test account, although those are usually clearly marked.