I have this fixed for the next Genosis Core release - root cause was actually the Profile URL was not including the profile id on the URL, so it would find the "New Person" from your earliest "new tree" and switch to that instead.
I will try to get a new Core release out tomorrow morning - I'm still in the middle of changes for this ticket:
http://www.genosisfamily.com/tracker/778/get-hard-coded-english-strings-into-the-language-file
so don't have it ready for release yet, and I'm going to be out of the office for the rest of the day today.
For now, if you go in and Modify the "New Person" and change their profile name one at a time for your new trees, it should work properly (i.e. when you click on the New Person it will take you first to the oldest "New Person" - modify it, save, then go back to your newest tree and click on 'New Person' again, modify, save, and so on and eventually you'll get to your newest tree and then each "New Person" now has a unique URL).
Hope this helps!
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Brian Johnson
Founder and Lead Developer - Jamroom
https://www.jamroom.net
updated by @brian: 12/29/14 09:23:55AM