synchronization .
Simply put, the website LAGS.
I don't say it cannot be my fault, my PC is actually notorious for internet speeds below half a Megabyte, but when a change is made, the website should register it as such, not warn me again about things that weren't done in the past but are already finished now.
It's like plugging in 10 devices, forgetting to plug the last, getting a warning about Device #10 not being plugged , but when you plug it and restart the whole thing it still says device #10 is unplugged.
It also happens to forum posts for me. After I will post this, I won't be able to see it for 25 seconds, and I will see the rest of the forum updating in real time, only MY post appearing with a delay. Same with messages/notifications. I receive one, I click it, i read it, five minutes later I still see the notification about new message even if I read it and I'm sure nobody else messaged me.