I cant get my cards back in the browser

Hi

I have a problem with my cards. When I try to download it, it tells me that I already have the cards, but I cant see anything either in broswer or the decks I can only see 12 cards. I have sent you two screenshots and hopefully you can understand what I mean. Sometimes I even get a note that says “This will delete your current one collection and replace it with data from the file you import. Are you sure?” Why can I not have more collections, and if I can how do I do it?

Try searching for some of the card text. Maybe the cards are in a different deck.

I searched and there is nothing