I see. Please ignore my comments about Group by Cluster, which I wrongly assumed that you are using. You are actually using Group by Vertex Attribute.
I think the problem is that your isolates did not get put into the department groups they belong in. They are in NO groups, and NodeXL places all ungrouped vertices in their own box. (It doesn't put all isolates in their own box; it puts all ungrouped vertices in their own box.)
If your isolates were not set to "Show" when you ran Group by Vertex Attribute, then NodeXL completely ignored the isolates and did not place them in groups. You set them to "Show" afterward and that caused them to appear in the graph pane, but they remained ungrouped.
The solution, then, is to run Group by Vertex Attribute again, while the isolates are set to Show. They will then be grouped properly, and they should appear in their correct department boxes in the graph pane.
-- Tony
I think the problem is that your isolates did not get put into the department groups they belong in. They are in NO groups, and NodeXL places all ungrouped vertices in their own box. (It doesn't put all isolates in their own box; it puts all ungrouped vertices in their own box.)
If your isolates were not set to "Show" when you ran Group by Vertex Attribute, then NodeXL completely ignored the isolates and did not place them in groups. You set them to "Show" afterward and that caused them to appear in the graph pane, but they remained ungrouped.
The solution, then, is to run Group by Vertex Attribute again, while the isolates are set to Show. They will then be grouped properly, and they should appear in their correct department boxes in the graph pane.
-- Tony