It's hard to say right off what could be causing the issue, especially without seeing the code or project.
My hunch is that the nodes are not being added to the second grid container, so that's why they are not showing up. If you run the code and look in the remote scene inspector, does the second GridContainer show any nodes? You can find the remote scene inspector by running the game in the Godot editor, and then in the scene tree view on the left side, there should be a tab named Remote that will let you see the currently running scene's SceneTree. That's what I would check first, to see if the nodes are being added correctly.
