Good evening, @mkeller44 ...
Have you checked your "Account" >> "Notifications" page in Canvas to see if you have a setting turned on that is alerting you of changes to this assignment? Specifically, when you are on your "Notifications" page, look at the row called "Course Content" under the "Course Activities" heading. If you hover your mouse over the words "Course Content", you'll see that one of the things it notifies you about is changes to Assignment content. There is also a "Due Date" row on the "Notifiations" screen as well which you might want to look at.
I hope this will be of help to you. Sing out if you have any other questions about this...thanks! Take care, stay safe, and be well.
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