as i read it, i thought-- Ah ha, another person who doesn't quite know how to use insert.. (a tech discussion we had here last month..)

so they orgingally had "badly wrong"
and editor read it, and said.. "Poor usage-- use "wrong turn" (or the opposite, they had wrong turn, and it was suggest "badly wrong" would be a better choice...)

the added one word, and forgot to delete the other, and ended up with a badly wrong turn.

and no one double checked the copy!