I noticed this few times. I see some player standing, but I can't target it. It seems that player is no longer in that place and if I reloged, it would disappear. Its like "ghost" of player is left . Yesterday when I came to Gludin, I saw lots of people standing near GK. I set up a shop there and left if for the night. Next day when I could see all those players standing in same place. When I tried to target any of it, I could not. When I reloged, they all disappeared.