Filtered cards in deck

[andreasebro]

What does it mean when some (not all; only the oldest) cards of my deck says they are ‘filtered’ and don’t show up for review? How do I reset it so they show up for review?

Thanks in advance.

[Danika_Dakika]

You have pulled them into a Filtered/Custom deck. Empty that. Filtered Decks - Anki Manual