Error to calculate the load in a plan

Hello,
 RTC: V5.0.2
Process template: Scrum

I don't understand the calculation done a plan. The setup is:
- A project area with scrum template
- 2 teams in this project area
- 1 iteration, sprint1, during one day.
- 1 user declared on both teams: he works at 50% for the first team and 0% for the second team.

Use case 1:
- plan with owner "project area" and iteration "sprint1" => the global load is 8 hours available

Use case 2:
- plan with owner "team1" and iteration "sprint1" => the global load is 4 hours
- plan with owner "team2" and iteration "sprint1" => the global load is 0 hours

We don't understand why the global load is 8 hours in the use case n°1 while the user work only 4h. If you remove the user from the team2 where he works at 0%, the global load will be 4h.

Does anyone has an explanation?

Thank you in advance