Simulation loosing tokens.

Hi all. I hope somebody can help me. I have created a process but some of the tokens get lost trought the process. If I send in a 100 only 90 comes out the other end. I did a test and found where the problem is but can not say why. As you can see in the image I have 2 gates that have 50 / 50 distrobustion. It should send 19 to the last task but it sends 0. Why is this ?