Well, many people will make more then one character. I have gotten a few hunter and lock items too, but luckily not a legendary, I'd be pissed. Almost seems like diablo 3's smart loot. You get items for your class most of the time but you have a small chance of getting another classes item. That or could be a bug.
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It's not a bug they can be used by a new character if you put them in the vault... Sucks if you only use one character though I have a titan helmet I won't ever use...