OP should mark this as the solution for people to fix it. It lasted for almost a month for me and I was starting to get really frustrated. Thanks so much Sam.
Looks like there is a Console error that happens in the browser. Each time you right click it fires another and the counter just keeps going up: I wonder if there was an update made that broke it on their side and they aren't aware it's happening? Going on 2 weeks with it not working, really start...
That could make sense if the data didn't correct itself randomly as well though right? It's not as if the Visitor never is classified, its that they are classified, unclassified, and reclassified within 5 minutes of each other.