Complete Chapter button not working/activating

Hello Hugging Face,
I have been going through your course and it is and it great. I did run into an issue at the end of chapters 2 and 3. Once I complete the quiz I am not able to press the Complete Chapter button. I expect that I am missing something. What are the criteria for it to become available? I do believe I have been through every section of the two chapters though it has been on different machines but using the same account.