You have that pcg graph set up more like a sub-graph. If that’s not your intention, use the GetVolume node plugged into your BoundingShape rather than Input and move your staticmeshspawner to after transformpoints. You don’t need the Input, Output or Debug nodes for your main graph.
I find it really helpful to use the ‘A’ key when over a node to show the data flowing through a node. It will show up in the panel below your graph. You will need to select the PCGVolume Instance in the lower left panel to get it to show up. This will help you understand what each node is doing with the data.