what version/browser?
but also happens on default android browser (Android 2.3)
It happens in a lot of sites, I wonder what it is that people do that cause that.
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" user-scalable="no">
See: https://github.com/h5bp/html5-boilerplate/blob/ed906cfb1b429...