I am unsure if this is a bug, or perhaps this is how it's supposed to work.
For me, whenever I use the flashcard review in the words tab, the words no matter if I say I was correct or incorrect will depleat from full bars to the minimum of 1 bar in less than six hours. I would have thought, they would have at least gone slower than that. I was trying out a new way to review through words to regolden my tree but this method seems more time consuming because you have to repeat it so often.
Is this happening to anyone else? Is this normal?