I've been liberally using the tool since it's one of my favorite things about EFU necromancy, and as they remain neutral to me they appear as blue but I've heard quite a few conflicting reports.
Some people say they see red undead mixed with blue undead, while others have said they've found all blue undead. Granted this is something I do through rests as I experiment and such.
I'm just brainstorming but two things come to mind:
1) if I release too many undead does it factor into things?
2) If I release them too -fast- does it factor into things?
So far I'm able to fire the player tool off in quick succession using hotkeys so I can release like 4+ undead in very very short time. Would that cause the issue?