Fasting is treated differently from prayer
Keep these two apart, because people run them together and then get frightened.
Prayers missed in nifas are not made up. Missed Ramadan fasts are made up, on the ordinary rule for a person who had an excuse, at a time you can manage. Not now, and not while you are in the state this course is about.
Being told to make up fasts is not a punishment either. It is the standard treatment of a fast that was legitimately not kept.