Help Duplicate contacts can't be deleted or merged

[Android Question]

I've just got a Samsung Galaxy Core Prime, and it's running Android version 5.1.1. I lost all of my old contacts, so I've been putting new ones in manually, but every time I add a contact it appears twice. I can't merge them, because the merge button only appears on one of them, and the other doesn't appear in the list of contacts to link.

If I delete the contact that I added, it deletes both entries. If I try and delete the duplicate that it has added, it says:

"You can't delete contacts from read-only accounts, but you can hide them in your contacts lists."

I can't figure out how to hide them, but that screen has the option to cancel or delete. If I delete, that entry goes away, but it reappears by itself when I do the same thing to the next duplicate.

How do I get my contacts to only display once per person?

 

[girolez]

Well that's odd.

What type of contacts are you adding? (There is a dropdown at the top of the new contract screen)

Google (and is it the prime account on the phone?)
Phone
SIM?*!
Samsung