I am running into issues where the "Hide Learner View of Grade" option was used in an Assignment. It performed its function and was then turned off—everything in the Assignment and feedback screen (and the same from the student's view) was hunky-dory.
The issue arose when looking at the associated Grade Item as the scores never appeared there. Typical remedies did not work (break the association, create new Grade Item, etc.).
I finally toggled the "Hide Learner View of Grade" back on, then off, then updated feedback to fix.