Team selection does not work as expected

It is not clear to the user which teams are eligible to be played.  Once the user selects a "preferred team", he often does not end up on that team.  When the client sends a CP_OUTFIT packet to the server, it includes a team UInt8 which is 0, 1, 2, or 3.  But we haven't been able to figure out the pattern of how the selection works.