Feels like a bug...
If I have 2 emails for a person saved, only one shows on their main page. It was the one on top. I wanted the other one shown. Assumed I could do this by flipping the order, assuming it would show the one on top. That didn't happen. After hitting 'update' it still showed the first one, and then when i went back to person's page with details (with both emails) it put the back in the original order instead of the one i changed it to. I suggest you change the database logic or whatever is under the hood.