The linked query "[[Category:Episodes]] [[In anime series::2]] [[Series version::original]] [[Episode number::2||4]]" appears to return random data that doesn't fit what was queried. Instead of episode number 2 or 4, random episode numbers like 24, 57, 13, 48, etc... are returned, and they are returned out of order even though the query is also told to sort by that number.
Appears to be present in trunk, 1.5.4, and 1.5.3.