Removing a robot in an IM group is removing it from IM directly requiring that the robot be restarted.
Also if I try to remove the robot via right click > Properties on the group, I am unable to actually see the robot to be deleted:
Component: Infrastructure Manager (all versions)
The proper method for removal is using properties. When deleting directly in the group it will remove from IM as well. This is normal behavior.
This has been resolved with the following version of IM. It will be rolled into CU10.
The dialog has been changed so that you can now resize the popup window. By resizing you will be able to see the robot name, so that you will be able to pick which one you would like to remove.