RhinoFish - 6:34 pm on Nov 19, 2012 (gmt 0)
As clear a case as this seems, we don't have enough info. You could have fraud, a tracking issue, or perhaps the fugliest app download page in history (when viewed on mobile).
G does an excellent job of monitoring for fraud, put it low on your suspicion list.
Survey some people in a device specific environment.