Bug with app, won't reset

I ran into some trouble in Fundamentals II, right when starting functions on Money Changer. It kept telling me the original code was edited and that I needed to use the reset button but I wasn’t given the option. I chose to reveal the answer and try an alternative exercise but there was also some problem with this one. I closed and opened the app and restarted my phone but nothing changed. I took some prints of the alternative exercise (Dollar Dollar Bill)