User blog comment:Dopp/Technical Update: March 13, 2012/@comment-1142365-20120313200435

This isn't a recent problem or anything, but articles with lots of article comments sometimes get their comments messed up if the page is deleted and then restored, or moved and moved back quickly. The article comments here was wiped when the page was accidentally deleted and quickly restored, and the comments are nowhere to be found. The article comments here got wrecked when the page was moved to a new destination and then back quickly.