shop floor workbench join team member list

Hello

We have employee ID 130081 in shop floor employees and set up his default team as SPL5, but in Current Team Employees, his team is SPL3, when to go shop floor workbench> join team this ID only can find from SPL3, some question here :

1. shop floor employees, the default team can be filled in by batch (or from other screen) instead of select ID then fill in one by one?
2. shop floor workbench, when enter as team of SPL3, so 130081 only can find in SPL3, not SPL5, what is the reason?
3. What is the different of “Team” in “Current Team Employees” and “default team” in “Shop floor Employees”?
4. The “Team” in “Current Team Employee” can pick up from which field by default but not manual input?

Thanks

Susan