Sounds like a factory "fault". I'd return it. I'm quite surprised, actually, since KuL has a very good reputation here.
Then again, Cherry QC is lower than it used to be and they seem to be reducing the number of Blues they're trying to make. Could be related, that perhaps they're harder to make consistently when making them fast enough to try and meet demand. But that's pure speculation and doesn't seem right, since they're looked at as the modern clicky mechanical switch to the greater unwashed masses.