I'm a little unsure of your question. Are you saying that there are zeroes in those 2 columns for cards you have in the decks? Or zeroes in those 2 columns for all your other cards?
If the former, that would be a bug.
If the latter, then if I'm understanding you correctly, you were expecting to see how many cards are left over after the built cards are subtracted? E.g. If you own 6 Lightning Bolts but none are in decks, you expect those columns to display 6. If you add 4 to a deck, those columns will then display 2. Was that your expectation? I apologize if I'm misunderstanding you.
As you may have already figured out, after further exploration of your own, is that those columns actually display the sum of a given card in decks, not the difference left over -- you'll have to mentally calculate that yourself. So in the above example, the column would go from displaying a 0 (0 Bolts in any decks) to 4 (4 Bolts in decks).
Note that with Premium, you can also choose whether to share cards between decks or not. If you share, then having 2 decks with 4 Bolts each will only show 4 in the Deck Column, whereas that column will show 8 if you don't share.