This looks very much as if the font renderer is aggressively hinting to the pixel grid vertically, but not horizontally. That’s a known trick for getting a decent compromise between crisp text (along the baselines and tops of letters) with subpixel horizontal kerning. I doubt the Android renderer is really broken and no-one has noticed until now, so I’d guess the font either has bad hinting, or more likely it’s just…
Explanation and comparison between platforms: https://mobile.twitter.com/mcclure111/status/142590242262759...
So broken hinting it is. Embarrassing that they didn’t pick it up in testing.