Flashcards scheduled in the past?

I realized some of my cards are scheduled in the past.

Here’s an example

Does this mean my app is broken? Why are these cards scheduled for 2020 ??? Won’t I see those flashcards again?

This means they are overdue. So they were due at that date, but you didn’t review them. This could have multiple reasons:

  1. The cards are suspended.
  2. The deck has a too low “Maximum reviews/day” setting.

thank you! i have fixed this by raising the maximum reviews x day