multiplayer: Change level in 2 different times (first server after player)

Hi, this is what i want:

I have the server that when the server is created switch from the level A to level B, now the client connect to the server, but it stay in the level A, so it cant receive messages from level B (but the chat work anyways i dont know why), after the client click a button and go to level B, but the server see the client spwned, but the client dont see the server that it was already there (it isnt spawned)... the change level at same time works well, but in 2 different times not, is like the levelPrefix dont works correcly... why?