Custom Study - tagged cards not all showing up

I tried reading some postings on here but I am still struggling with my issue.
I am trying to custom study from a large deck with around 1k cards. However, when I do custom study and choose the tag I’d like to study, only 20/130 cards show up in the deck? When I go to the browse section, I see that there are 130 cards with the tag in the large deck that I am trying to study. Why are only 40 appearing in the custom study? I need to study all the cards with a certain tag. How can I do this?

With the old scheduler, filtered decks can not fetch cards that are in learning.