"Entire Network" and "All Services" are two different subtrees. Network tree created and maintained automatically based on IP topology - nodes belongs to subnet objects according to IP addresses configured on it. In service tree, you can organize objects in a logical hierarchy. You cannot move node from subnet - you can only move it between two containers in service tree. If you need to place node in container in service tree you should use "Bind" operation - select container, right click on it, select Bind, and select node(s) you wish to place into this container.

Best regards,
Victor