Thanks for the welcome!
The set was shipped from massdrop, but I'm not sure who bagged it up and would have the extras. Seems like the best thing to do is just ask Massdrop support for the extra key, hopefully it won't take too long. If anyone else had the opposite problem, PM me and we can do a swap.
Its good to hear its a pretty normal thing, as its my first keyset I thought I was crazy for a bit.