Hello there, @StevenFitzgeral ...
Unfortunately, much of your question would not be able to be answered by Community members here in the Community. Due to the nature of your question, I believe it would be best to reach out directly to your instructor(s) of the courses(s) for those particular assignments. They would be the best ones to help answer any questions related to how they have those assignments set up, any assignment details like re-submissions, and how those might affect your grade. We here in the Community wouldn't be able to answer those kinds of questions because we don't have access to your course(s) or your school's Canvas environment. Hopefully you'll be able to reach out to your instructor(s) soon about this, though. You can contact your instructor(s) directly in Canvas by following the steps in this Guide:
How do I get help with Canvas as a student?
Good luck, and let Community members know if we can be of assistance...thank you!