Organization Goal Plan missing departments

Summary

Not all the active departments are assigned to the Organization Goal Plan

Content

Hello, 

This is the first time, I have created an Organization Goal Plan, so maybe this is a know thing for you. 
I have created the organization goal plan and selected all departments to be eligible for it. However, after I have run the 'Manage Goal Scheduled Process', not all the active departments have been assigned to the Org goal plan. 

Do you know the logic behind it?

Thanks,
Dóra