Thanks for your help Este, this definitely helped me.
I just want to know one more thing which is when I create a product on a process node it is not creating directly on top of the process node rather at some other location. This is kind of strange as it has not happened before. Can you please help me with that?
As in the image you can see that the part is created inside the conveyor somewhere. I know I can change the frame/coordinates of the product/assembly that are being created (because then it changes properties for when I want to create the same product at another location, but I have never done this with other layouts as it automatically creates that part on top of the process node.