These two edits on [The Others (2001 film)] and both seem to have copied large amounts of content. Not sure if it is an HHVM bug or the result of user error.
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I've asked a dev to take a look, and that doesn't seem like anything that would be related to HHVM. So, it's either user-error, or something else is involved. I've left some notes at w:User talk:AndyFielding#Accidental content duplication, just in case.