We are here to help!
Yes, those are subdecks. The AnKing Step Deck doesn’t come with subdecks by default, so that subdeck structure was likely already there.
Updating your AnKing deck or resetting local changes won’t automatically organize the cards into subdecks. Therefore, you will need to manually move the cards containing the “Bugs” tag to the “Bugs” deck that already exists.
To move cards from one deck to another, just select the cards you want to move (in this case, select the “Bugs” tag). Click on one of the cards and press Cmd + A (on Mac) or Ctrl + A (on Windows) to select all of them. Then, right-click, select “Change Deck,” and choose the deck you want to move the cards to.
This tutorial can help show you how to move cards: How to move cards from your old V11 deck to a new deck
Let us know if you need help with anything else. 