As you have noticed, @JennyGodley, the original grade is not kept within the SpeedGrader. However you can see the original grade by viewing the grade change log. A document in the Canvas Guides describes how:
How do I view the history of all grading changes in the Gradebook?
However, students do not have access to this and therefore your kindness in sharing that via a comment is something they hopefully appreciate. Giving students access to grade history is an excellent suggestion. The best way to make Canvas better by adding new features is to use the idea process here in the Instructure Community. Information on how to do this is on the following page:
How do Ideas and Themes work in the Instructure Community? .
Creating an idea does not provide an immediate solution to the problem you described, though it is a solution. I’m going to mark it as such and hope that our colleagues who have a similar challenge will find the best way to contribute. If you decide to create an idea, please link it here.
