I've been mining using Netflix, and always after making a card for some words I change their status to seen. But when I continue the next day some words are back to being unknown. Is there something I'm doing wrong or is this a bug they plan to fix?

I'm basically trying to make everything as tightly packed vertically as possible. But with the premade Migaku Japanese note type, if you have more than 1 target word with audio, the play audio buttons stack vertically, and not horizontally. What do I change in the code to make them go as in the picture below? Thank you.