Fwiw, in "Numberman's Pizza Party | Addition within 5", after the question (and answer) has changed, clicking on a box with the old (now incorrect) answer yields correct pizza. And the reverse. It seems box correctness is set at creation, rather than reflecting the current question? Which sets up a dynamic of look at question, click on "correct for current question" box, get told it's wrong.
Yup, that caught me off guard, too. Perhaps a solution would be to have a gap where the old pizzas finish but no new ones are added, then change the prompt and start new pizzas when the screen is empty. Another problem I saw in that game: At one point the prompt was 50 45 __ 35 but it wanted me to click on 30. That was in the Skip Counting By 5 game.
This is a great catch. Thank you. We are cooking up a solution!