Issues with axis systems

Hello everyone! 
I have an issue with axis systems and how products behave in some scenarios. When I create a conveyor resource and a flow, sometimes the products in the flow move from a different starting point and not the one I set in the flow. The same goes with the create activity where the product is created in the 'yellow' axis system generated by the system. What I want to learn is how to change the axis system so that I can control how products are created and moved in different resources. I'm not sure how to use the User Assistance or University website to learn about this. Does anyone have any advice on this subject?