Players dont spawn right after they join the server. Happens to about 90% players. Kind of annoying and makes people leave the server when a waiting is going on for missing players. Hope its fixed soon.
Attached a clip where I am the only one spawned in the server. Rest waiting for 3 to join. 
PS-forgot i was recording so just watch the 30-40 seconds from the start of the clip.
Link to the demo file- https://drive.google.com/open?id=0B5X8ef...19JcWtXTDg