Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
Whichever the older one is what I want to keep. The second one was created when my son joined as a Lion, even though I put my existing number on the partner application.
@CressieVargo I would recommend contacting your local council and ask them to put the Lion Adult Partner registration under BSA member number 12010078.