Am I paranoid or is something weird going on at GR?

Ok, so I log onto GR to add a book (or two) to my WL and I see that a very old review has been updated 4 hours ago.  Screen shot below. Well, four hours ago I was sitting in traffic and hadn't logged onto GR yet. I feel very paranoid right now. Has someone hacked into my account or is GR staff screwing with my content? The review seems to be intact but I feel unsettled  . . . 

 

**UPDATE**  Apparently this is happening to others and is another so-called bug. Color me paranoid but I still feel like someone is picking through my data.  Here's the thread which I've only just begun to read.