Updation of contacts on icloud

I have 4 devices on same Apple ID. Latest things are there on the iPhone I use. It has about 3500 contacts. For some reason the other devices have less and not-updated contact list. How do I ensure that when I backup on icloud, the latest 3500 contacts of my iPhone are the only ones which get updated across all 4 devices. Also, is there a possibility I lose my contacts on the iPhone during backup if icloud updates from some other device?
Manish VermaIT expertAsked:
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Change the default in Settings back to iCloud

Launch the Settings app on your iPhone or iPad.
Tap on Mail, Contacts, Calendars — you'll need to scroll down a ways.
Under Contacts, tap on Default Account.
Make sure iCloud is selected and NOT On my iPhone.


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