I’ve only noticed this for New York Times feeds, so I don’t know how prevalent it is.
Some stories, when viewed in Text view on iOS v3.6, sometime have a weird “text bubble” stretching all the way across the screen at the beginning and end of the Text view. The top bubble seems to eat the title of the story (but it’s obscured so it’s hard to tell), and the bottom bubble eats the last several paragraphs (I think but it’s hard to tell how much).
A good example is the story “Building Faces Wrecking Ball. So Does Couples’ Friendship.” http://www.nytimes.com/2014/01/19/nyr… in the “NYT > Home Page” feed.
For that same story, the web version also has little bubbles (rounded rectangles) in the same places, but they are small, stand-alone, and don’t seem to eat any text.