Use of "From Conveyor Process" and "To Conveyor Process"

I can’t get the boxes to move out of the “XYZ Bundler” without using a conveyor. As you can see, using a conveyor the boxes come out as I want, but when using the elements “From Conveyor Process” and “To Conveyor Process” the first boxes come out well but the next ones enter the “XYZ Bundler” rotating and disappear. What can I do?