Last time I was at Apple they did something so I got my gmail back on my phone. Since then, or maybe since my daughter set up an iCloud account, two things happen:
I get all my daughter's contacts and notes (which isn't a bad thing, she's a teenager and that info is good)... but why?
And the main thing: even if I add a contact in manually with a name and phone number (not entered with the 1+ in front of it), some time later they all disappear and are replaced with only the number plus the 1+ in front of it and no names so I have no idea who any one is.
I've reentered the names into the contacts when I've gotten a message or phone call from someone and still they go away again later the same way.