Problems with nested Forks

First off, I apologize for not having made the unit tests, but do not have time at the moment and I think it is a conceptual problem and a unit test would not provide much.
I am integrating jBPM version 4.1 and it proves there too.

The situation is this:
When launched a nested Fork1 another in the second Fork repeats one of its tasks.
In the xml it becomes clear what the situation.
Maybe it is a conceptual issue, and I who is mishandled.
I would be grateful if I can help, as I searched in different places this situation and found no alternative but to post it here.

Greetings.

Sebastian.