Merging MCAT Deck just created duplicates

I have been using the AnKing-MCAT deck for a while, and I tried to merge using AnkiHub with the updated deck. Instead of merging, however, it created a duplicate deck (screenshot included).

How can I successfully merge these? The AnkiHub deck is showing that I have already learned cards, so it cannot only be new cards. However, I don’t know if I can delete the old deck and only work from the AnkiHub deck, or if it is not only duplicates in the new deck.

This is answered in this wiki under why do I have two anking decks

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