Can't pick any of them up? I think the dropped item bugged. o-o
Have you tried killing other monsters and picking up their drops?
This happened to me a lot, I would often check in /boxes by killing sneevils and accepting their cubes to see if the item that dropped bugged(if i can accept the cubes, the dropped item was bugged, if not then its the server) or if its the server.
Bad luck I'd say. Most probably think it has something to do with your net.