Cards not showing up in tag

I’m having a continuous problem with cards not showing up under the proper tags. We have a large deck with AnKing cards + cards people from my school have made that are all tagged for each lecture. I’ve always just gone to the tag for the lectures each day and separated them out into my own subdecks, but lately, only 15 cards or less have been showing up in the tag when my friends who downloaded the same decks have 50+. When I search some of the words in a certain card showing up in their tag, it is in my deck and on tags, it shows it has the proper tag, but it’s not showing up on the side when I browse that tag. I have tried updating my anki and have Better Tags but no luck.

Tried Tools>Check Database in the main window?