What gives, you ask? Not quite sure, but I'm here to remedy it.
"Whirring" was actually first released as a single back in 2009, on the band's debut EP A Balloon Called Moaning. It had a good bit of success, so they decided that when their full album was released in 2011, it'd be one of the leading singles.
Apart from that, I don't have much more to give you. So sit back, and enjoy!