Using 'Work Process' for conveyor task with many worker

Hello together,

I want to simulate conveyor task include many workers.
I used ‘Work Process’ to assign tasks to workers.
Things seemed to be going well when workers picked up the product, but it didn’t work well to place the picked items on ‘Work Process Panel’.
Workers wait forward process to place products.
I can’t understand this situation.
So, please I want you to help me.

Unfortunately, my Visual Component is version 4.0.
I attached a file.
question111.vcmx (2.2 MB)