Closed Not being put in Stable Satrbound

My friend keeps trying to play Starbound but when he goes into the game it says he is playing Starbound-Unstable instead of regular Starbound.

Also when he gets into the game and presses E to interact with something it immediately kicks him out with no Error Message.

We have tried deleting the content of Starbound Unstable, Re-installing Starbound, and we also made sure he was not in the Beta.

All of this happened on the Multiplayer server.

It does not kick him out when he plays on Single Player
When he is on single player server it says Starbound-Beta in top left hand corner of screen