Hey i found this somewhere from the guy in other threads having problem like yours.
The Stay with in world bounderies happens when.
Quote:
Originally Posted by Psymetrix
i) No Player Classes were added.
ii) SetGravity is is too high.
iii) Setting the players position too far out the map.
iiii) Setting the players velocity too high.
iiiii) Spawning a boat on water. (Quite rare but does happen)