Yes, on two occasions. A week ago, my page view traffic jumped by a factor of 10 for about 5 days, then settled down. I've checked with HubPages technical, and it's still not clear if that one was real page views, or the result of a bug.
Then there was a sudden miscount - 500 slideshow views in one day. That was definitely caught as a bug by the HubPages technical staff.
I hope your traffic is real, though. Either way, keep writing!