Not sure if it's a bug but never noticed it before. Normally if a user posts a wide image, for extreme example 4000x2500 the default template of the website stays the same width as the device but you get a horizontal scroll bar, so you can scroll off the website to view the right side of the image.

Viewing on the Nexus 7 Chrome it brings the right side of the website in and shrinks the website width to a quarter of the image? I know you can thumbnail images but not everybody does that.