Below you can see the issue, All i have changed between the shots is the pin connections, nothing else.
In the right image the blueprint was copied and pasted from another BP within the same project.
In the left image the blueprint was made in situe.
I have redone this a couple of times, always with the same result. Please let me know if you need any other screen shots and ill be happy to provide them.
From what i can tell, this is the only difference between the two.