The number of review card don’t seem go down on the Future Due graph.
I am working through backlog of cards. The card due used to decreased once I started to review them. But when I review my card, it does not decreased even after I reviewed them
It sounds like it decreased to 3, and you’re wondering why it didn’t decrease to 0? Most of the reasons I can think of have to do with siblings, burying, limits, decks, and suspendeds. But I’d be guessing if I just started saying things, so let’s find out what cards they are first?
You can click on that bar in the graph, and Anki will show you those specific 3 cards in the browser. That’s the easiest way to figure out what happened.