This has been going on for a long time now - I don't have any recent reports as I haven't drilled into that area recently, but some 6 months ago I had 60 instances of a keyword phrase that was... strange. Not impossible, just people don't talk that way. This was across a month and not once did it appear in my logs. I checked carefully because I was so dumbfounded to see so many instances.
The high level of GA matches my other reporting efforts, but the detail is sometimes just off.