Anking v11 deck vs Anking v12 deck missing cards/tags?

So I’m noticing for particular sketchy videos in the v11 deck I have cards in them that didn’t transfer into the v12 deck. what is going on? I’ve been wasting time trying to find an answer someone please help!

They may have been deemed duplicates and removed from the deck. Many of the videos have overlap

got it thank you. Also, I’ve unlocked a deck (Sketchy path Intrvascular anemia) and some cards are just blank with nothing on it, but when I suspend that particular card I can see that it has text and information when I’m on browse. not sure why that is happening

Those are one by one cards, you need this add on AnKing Note Types (Easy Customization) - AnkiWeb

You can learn more here The AnKing Note Types and Add-on - YouTube

You will need to check “flip to back automatically” and it will resolve this issue