Custom study excluding questions

Hello. I am trying to use custom study to study four tags that I have for 4 different chapters. When I click the browse section it shows I have about 200 cards when I add up all the tags but when I use custom study there are only 116 coming up. How do I make sure all cards are being included?

I received this error. " No cards matched the provided search. Some cards may have been excluded because they are in a different filtered deck, or suspended."

Perhaps your custom study selection is limiting the cards somehow, eg only new cards?