Hello, Glenda! Thanks for using the Canvas Community.
It sounds like the Section that was associated with the course was removed. Things like grades and student submissions are tied to those section enrollments, so when those are removed you'll see all the course content (i.e. the actual assignments, pages, etc) but things like grades and submissions will be gone.
Not knowing how your institution handles enrollments, I would suggest you reach out to an account admin to determine what happened to that section.
Hopefully this helps...if you have more information after taking that step but still need clarification, I'd be happy to support!
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