Wonderful! Thank you all so much, especially nc50lc.

Wallet C (actually it was the first one that I created) contained all 3 seeds, I didn't know that was possible.
I assumed when creating a wallet and you insert the 3 seeds, it would store the first seed and compute the public key of the other two and store them.
It's confusing the UI is showing the "main said" and not the others.