Can you share the package we can try?
The issue could be the the left and right container are sharing the same policy.
Try creating 2 more components responsive-left and responsive-right as proxy of responsivegrid and set policy with those 2 new components.
Can you please check if the left-container is getting created inside the initial of the template(templates/template-name/initial/jcr:content/root/container/left-container). If that is the case, you can remove it from initial page of the template. This will lock left-container and wont allow editing once page is created.