I couldn’t get the clearest picture of the button, but you can see the gap at the front of it. Believe me it is much larger then it should be, and the button is off-center.

A clearer picture would be nice, but the final-plastic units I've seen don't display this characteristic. (At least not to that great a degree. There's gotta be space around the button so it doesn't get stuck.) Like I said, they went through a lot of revisions to make sure the plastic wasn't gappy. This could potentially be an individual rare defect rather than a design flaw.