Multiple Learning Assignments for a worker with multiple worker assignment

Summary:

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We assigned 1 Offering and course assignment to an employee with multiple assignments. When we searched for the user's name, we only chose the one specific assignment (as highlighted in the screenshot below)

However, after submitting this - the learning item got assigned to all of her assignments (see managers column to differentiate):

And when we tried to complete the Offering with Jonas as the manager, all of the assignments got completed together:

Then we checked Juliane's talent profile, 1 learning outcome was assigned (which is good).

Now our question is - why is it that all worker assignments gets assigned a learning item even though we just chose 1 specific worker assignment for Juliane? Is this standard or is this a bug?