@repent666
Each Disc comes with a CDKey. The CDKey is quite literally "the key", the physical discs themselves don't represent much other than a way to ship data.
A Key is used on an Origin Account. It is forever tied to that Origin account. Games are not tied to the computer they are installed on. That Origin account can be installed on an unlimited number of computers but only 1 can be active at a time. Since you have 2 copies, you should have 2 Origin accounts.
If you activated both the keys on a single account, your best course of action would probably be to contact EA here:
https://help.ea.com/en/contact-us/new/
We can't really deal with account issues here since it's a gamers helping gamers forum.