I don't know how to make payload map so I cannot help too much but are you sure the redspawn1 is enable and redspawn2 is disable in the beginning? If so, then another problem is that you made the team_control_point still have the I/O's for the teamspawns (what DaDema said)
You can only do it my way or his way and I think my way confuse you too much. If it is my way, remove the I/O's that target the spawns and make them target the relay. If you do that already then sorry idk nothing more.