This confused me for a while:
https://zh.wikipedia.org/wiki/Special:%E7%94%A8%E6%88%B7%E8%B4%A1%E7%8C%AE/Liangent-bot?offset=20130528041450&limit=4
Version: 1.22.0 Severity: minor
This bug may also exist on other pages using ORDER BY *_timestamp
The api query does not have this problem, but also only sorts by timestamp:
http://zh.wikipedia.org/w/api.php?action=query&list=usercontribs&ucuser=Liangent-bot&ucstart=20130528041450&uclimit=4