Hi @ljay1
Welcome to the Canvas Community. You will definitely want to reach out to your instructor about this, but speaking as a Canvas administrator at my own institution I can assure you that the assignment has not been replaced. While to your eyes as a student the assignment is seemingly over-written, the instructor will have access to all previous submissions from the group. To be sure, with a group assignment s/he cannot tell who submitted it, but the instructor can always see all submissions. The ability to view previous submissions is specifically mentioned here in the instructor's online guide: How do I view the details of a submission for a student in SpeedGrader? under the Evaluate Multiple Submissions heading. While that documentation is written from the perspective of a regular (non-group) assignment, the same information applies.
I hope this helps calm a bit of your anxiety during finals week, Liam! Your next job, however, is to contact your instructor.
Good luck with things!
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