On enwiki, see here: https://en.wikipedia.org/w/index.php?title=Sunday_Reed&diff=924973912&oldid=924917690&diffmode=source

I'm not sure exactly how the interface works, but either the bot or the person using the interface added "|title=Archived copy", I assume because the citation didn't have a "title" parameter already. But (as I understand it) that's not how {{cite encyclopedia}} works—there's an "entry" parameter and an "encyclopedia" parameter, and the template puts the link on the "encyclopedia" text (as it was before the change).

Perhaps the system could be modified to catch this case?