[Yashas]

You need to reset all the variables on Disconnect or at Connect.What happens is you registered and left the server.And you join again you get the same playerid.If you don't reset all the information of the previously logged in player, then the same information will be used for the newly connected player.

Just do this:
Clear all your player variables at Disconnect so that the new player how would take that playerid will have a fresh set of variables.