I've got two duplicate trees and can't seem to merge them

I'm wondering is it because I've added some family members into my tree as one manager and a family member from that family has added the same as another manager that I'm unable to merge them correctly?

I've tried to 'move' them but only some have this in their node menu. Others I've tried to merge or delete and now I'm in worse trouble than I began with!

Help please!!!


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