/setworldspawn error in multiplayer

I am playing in Minecraft 1.8.3 at the moment (Due to entity UUID Bug in 1.8.4) and am using Java 8. The problem is that when I have set a world spawnpoint in the world using the /setworldspawn command as usual but it doesnt seem to declare those to be the spawn chunks. What I expected to happen is when a new player join is that they will automatically join in that location but what actually happens is they spawn where ever in the world (random each time) unless you set a specific spawn point for THEM when they log on. I have tested this by deleting my player file from the player-data folder in the server files and re logging in, after rebooting it.